/*

* Cppcheck - A tool for static C/C++ code analysis

* Copyright (C) 2007-2021 Cppcheck team.

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program. If not, see <http://www.gnu.org/licenses/>.

*/

#include "check.h"

#include "checkbufferoverrun.h"

#include "config.h"

#include "ctu.h"

#include "library.h"

#include "preprocessor.h"

#include "settings.h"

#include "testsuite.h"

#include "tokenize.h"

#include <list>

#include <simplecpp.h>

#include <string>

#include <tinyxml2.h>

class TestBufferOverrun : public TestFixture {

public:

TestBufferOverrun() : TestFixture("TestBufferOverrun") {}

private:

Settings settings0;

#define check(...) check_(__FILE__, __LINE__, __VA_ARGS__)

void check_(const char* file, int line, const char code[], const char filename[] = "test.cpp") {

// Clear the error buffer..

errout.str("");

settings0.certainty.enable(Certainty::inconclusive);

// Tokenize..

Tokenizer tokenizer(&settings0, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, filename), file, line);

// Check for buffer overruns..

CheckBufferOverrun checkBufferOverrun;

checkBufferOverrun.runChecks(&tokenizer, &settings0, this);

}

void check_(const char* file, int line, const char code[], const Settings &settings, const char filename[] = "test.cpp") {

Tokenizer tokenizer(&settings, this);

std::istringstream istr(code);

ASSERT_LOC(tokenizer.tokenize(istr, filename), file, line);

// Clear the error buffer..

errout.str("");

// Check for buffer overruns..

CheckBufferOverrun checkBufferOverrun(&tokenizer, &settings, this);

checkBufferOverrun.runChecks(&tokenizer, &settings, this);

}

void checkP(const char code[], const char* filename = "test.cpp")

{

// Clear the error buffer..

errout.str("");

Settings* settings = &settings0;

settings->severity.enable(Severity::style);

settings->severity.enable(Severity::warning);

settings->severity.enable(Severity::portability);

settings->severity.enable(Severity::performance);

settings->standards.c = Standards::CLatest;

settings->standards.cpp = Standards::CPPLatest;

settings->certainty.enable(Certainty::inconclusive);

settings->certainty.disable(Certainty::experimental);

// Raw tokens..

std::vector<std::string> files(1, filename);

std::istringstream istr(code);

const simplecpp::TokenList tokens1(istr, files, files[0]);

// Preprocess..

simplecpp::TokenList tokens2(files);

std::map<std::string, simplecpp::TokenList*> filedata;

simplecpp::preprocess(tokens2, tokens1, files, filedata, simplecpp::DUI());

Preprocessor preprocessor(*settings, nullptr);

preprocessor.setDirectives(tokens1);

// Tokenizer..

Tokenizer tokenizer(settings, this);

tokenizer.createTokens(std::move(tokens2));

tokenizer.simplifyTokens1("");

tokenizer.setPreprocessor(&preprocessor);

// Check for buffer overruns..

CheckBufferOverrun checkBufferOverrun(&tokenizer, settings, this);

checkBufferOverrun.runChecks(&tokenizer, settings, this);

}

void run() OVERRIDE {

LOAD_LIB_2(settings0.library, "std.cfg");

settings0.severity.enable(Severity::warning);

settings0.severity.enable(Severity::style);

settings0.severity.enable(Severity::portability);

TEST_CASE(noerr1);

TEST_CASE(noerr2);

TEST_CASE(noerr3);

TEST_CASE(noerr4);

TEST_CASE(sizeof3);

TEST_CASE(array_index_1);

TEST_CASE(array_index_2);

TEST_CASE(array_index_3);

TEST_CASE(array_index_4);

TEST_CASE(array_index_6);

TEST_CASE(array_index_7);

TEST_CASE(array_index_11);

TEST_CASE(array_index_12);

TEST_CASE(array_index_13);

TEST_CASE(array_index_14);

TEST_CASE(array_index_15);

TEST_CASE(array_index_16);

TEST_CASE(array_index_17);

TEST_CASE(array_index_18);

TEST_CASE(array_index_19);

TEST_CASE(array_index_20);

TEST_CASE(array_index_21);

TEST_CASE(array_index_22);

TEST_CASE(array_index_23);

TEST_CASE(array_index_24); // ticket #1492 and #1539

TEST_CASE(array_index_25); // ticket #1536

TEST_CASE(array_index_26);

TEST_CASE(array_index_27);

TEST_CASE(array_index_28); // ticket #1418

TEST_CASE(array_index_29); // ticket #1734

TEST_CASE(array_index_30); // ticket #2086 - out of bounds when type is unknown

TEST_CASE(array_index_31); // ticket #2120 - out of bounds in subfunction when type is unknown

TEST_CASE(array_index_32);

TEST_CASE(array_index_33); // ticket #3044

TEST_CASE(array_index_34); // ticket #3063

TEST_CASE(array_index_35); // ticket #2889

TEST_CASE(array_index_36); // ticket #2960

TEST_CASE(array_index_37);

TEST_CASE(array_index_38); // ticket #3273

TEST_CASE(array_index_39);

TEST_CASE(array_index_40); // loop variable calculation, taking address

TEST_CASE(array_index_41); // structs with the same name

TEST_CASE(array_index_42);

TEST_CASE(array_index_43); // struct with array

TEST_CASE(array_index_44); // #3979

TEST_CASE(array_index_45); // #4207 - calling function with variable number of parameters (...)

TEST_CASE(array_index_46); // #4840 - two-statement for loop

TEST_CASE(array_index_47); // #5849

TEST_CASE(array_index_48); // #9478

TEST_CASE(array_index_49); // #8653

TEST_CASE(array_index_50);

TEST_CASE(array_index_51); // #3763

TEST_CASE(array_index_52); // #7682

TEST_CASE(array_index_53); // #4750

TEST_CASE(array_index_54); // #10268

TEST_CASE(array_index_55); // #10254

TEST_CASE(array_index_56); // #10284

TEST_CASE(array_index_57); // #10023

TEST_CASE(array_index_58); // #7524

TEST_CASE(array_index_59); // #10413

TEST_CASE(array_index_60); // #10617, #9824

TEST_CASE(array_index_61); // #10621

TEST_CASE(array_index_multidim);

TEST_CASE(array_index_switch_in_for);

TEST_CASE(array_index_for_in_for); // FP: #2634

TEST_CASE(array_index_bounds);

TEST_CASE(array_index_calculation);

TEST_CASE(array_index_negative1);

TEST_CASE(array_index_negative2); // ticket #3063

TEST_CASE(array_index_negative3);

TEST_CASE(array_index_negative4);

TEST_CASE(array_index_for_decr);

TEST_CASE(array_index_varnames); // FP: struct member. #1576

TEST_CASE(array_index_for_continue); // for,continue

TEST_CASE(array_index_for); // FN: for,if

TEST_CASE(array_index_for_neq); // #2211: Using != in condition

TEST_CASE(array_index_for_question); // #2561: for, ?:

TEST_CASE(array_index_for_andand_oror); // FN: using && or || in the for loop condition

TEST_CASE(array_index_for_varid0); // #4228: No varid for counter variable

TEST_CASE(array_index_vla_for); // #3221: access VLA inside for

TEST_CASE(array_index_extern); // FP when using 'extern'. #1684

TEST_CASE(array_index_cast); // FP after cast. #2841

TEST_CASE(array_index_string_literal);

TEST_CASE(array_index_same_struct_and_var_name); // #4751 - not handled well when struct name and var name is same

TEST_CASE(array_index_valueflow);

TEST_CASE(array_index_valueflow_pointer);

TEST_CASE(array_index_function_parameter);

TEST_CASE(array_index_enum_array); // #8439

TEST_CASE(array_index_container); // #9386

TEST_CASE(array_index_two_for_loops);

TEST_CASE(buffer_overrun_2_struct);

TEST_CASE(buffer_overrun_3);

TEST_CASE(buffer_overrun_4);

TEST_CASE(buffer_overrun_5);

TEST_CASE(buffer_overrun_6);

TEST_CASE(buffer_overrun_7);

TEST_CASE(buffer_overrun_8);

TEST_CASE(buffer_overrun_9);

TEST_CASE(buffer_overrun_10);

TEST_CASE(buffer_overrun_11);

TEST_CASE(buffer_overrun_15); // ticket #1787

TEST_CASE(buffer_overrun_16);

TEST_CASE(buffer_overrun_18); // ticket #2576 - for, calculation with loop variable

TEST_CASE(buffer_overrun_19); // #2597 - class member with unknown type

TEST_CASE(buffer_overrun_21);

TEST_CASE(buffer_overrun_24); // index variable is changed in for-loop

TEST_CASE(buffer_overrun_26); // #4432 (segmentation fault)

TEST_CASE(buffer_overrun_27); // #4444 (segmentation fault)

TEST_CASE(buffer_overrun_29); // #7083: false positive: typedef and initialization with strings

TEST_CASE(buffer_overrun_30); // #6367

TEST_CASE(buffer_overrun_31);

TEST_CASE(buffer_overrun_32); //#10244

TEST_CASE(buffer_overrun_33); //#2019

TEST_CASE(buffer_overrun_errorpath);

TEST_CASE(buffer_overrun_bailoutIfSwitch); // ticket #2378 : bailoutIfSwitch

TEST_CASE(buffer_overrun_function_array_argument);

TEST_CASE(possible_buffer_overrun_1); // #3035

TEST_CASE(buffer_overrun_readSizeFromCfg);

TEST_CASE(valueflow_string); // using ValueFlow string values in checking

// It is undefined behaviour to point out of bounds of an array

// the address beyond the last element is in bounds

// char a[10];

// char *p1 = a + 10; // OK

// char *p2 = a + 11 // UB

TEST_CASE(pointer_out_of_bounds_1);

TEST_CASE(pointer_out_of_bounds_2);

TEST_CASE(pointer_out_of_bounds_3);

TEST_CASE(pointer_out_of_bounds_4);

TEST_CASE(pointer_out_of_bounds_sub);

TEST_CASE(strcat1);

TEST_CASE(varid1);

TEST_CASE(varid2); // ticket #4764

TEST_CASE(assign1);

TEST_CASE(alloc_new); // Buffer allocated with new

TEST_CASE(alloc_malloc); // Buffer allocated with malloc

TEST_CASE(alloc_string); // statically allocated buffer

TEST_CASE(alloc_alloca); // Buffer allocated with alloca

// TODO TEST_CASE(countSprintfLength);

TEST_CASE(minsize_argvalue);

TEST_CASE(minsize_sizeof);

TEST_CASE(minsize_strlen);

TEST_CASE(minsize_mul);

TEST_CASE(unknownType);

TEST_CASE(terminateStrncpy1);

TEST_CASE(terminateStrncpy2);

TEST_CASE(terminateStrncpy3);

TEST_CASE(terminateStrncpy4);

TEST_CASE(recursive_long_time);

TEST_CASE(crash1); // Ticket #1587 - crash

TEST_CASE(crash2); // Ticket #3034 - crash

TEST_CASE(crash3); // Ticket #5426 - crash

TEST_CASE(crash4); // Ticket #8679 - crash

TEST_CASE(crash5); // Ticket #8644 - crash

TEST_CASE(crash6); // Ticket #9024 - crash

TEST_CASE(crash7); // Ticket #9073 - crash

TEST_CASE(insecureCmdLineArgs);

TEST_CASE(checkBufferAllocatedWithStrlen);

TEST_CASE(scope); // handling different scopes

TEST_CASE(getErrorMessages);

// Access array and then check if the used index is within bounds

TEST_CASE(arrayIndexThenCheck);

TEST_CASE(arrayIndexEarlyReturn); // #6884

TEST_CASE(bufferNotZeroTerminated);

TEST_CASE(negativeMemoryAllocationSizeError); // #389

TEST_CASE(negativeArraySize);

TEST_CASE(pointerAddition1);

TEST_CASE(ctu_malloc);

TEST_CASE(ctu_array);

TEST_CASE(ctu_variable);

TEST_CASE(ctu_arithmetic);

TEST_CASE(objectIndex);

}

void noerr1() {

check("extern int ab;\n"

"void f()\n"

"{\n"

" if (ab)\n"

" {\n"

" char str[50];\n"

" }\n"

" if (ab)\n"

" {\n"

" char str[50];\n"

" }\n"

"}");

ASSERT_EQUALS("", errout.str());

}

void noerr2() {

check("static char buf[2];\n"

"void f1(char *str)\n"

"{\n"

" strcpy(buf,str);\n"

"}\n"

"void f2(char *str)\n"

"{\n"

" strcat(buf,str);\n"

"}\n"

"void f3(char *str)\n"

"{\n"

" sprintf(buf,\"%s\",str);\n"

"}\n"

"void f4(const char str[])\n"

"{\n"

" strcpy(buf, str);\n"

"}");

ASSERT_EQUALS("", errout.str());

}

void noerr3() {

check("struct { char data[10]; } abc;\n"

"static char f()\n"

"{\n"

" char data[1];\n"

" return abc.data[1];\n"

"}");

ASSERT_EQUALS("", errout.str());

}

void noerr4() {

// The memory isn't read or written and therefore there is no error.

check("static void f() {\n"

" char data[100];\n"

" const char *p = data + 100;\n"

"}");

ASSERT_EQUALS("", errout.str());

}

void sizeof3() {

check("struct group { int gr_gid; };\n"

"void f()\n"

"{\n"

" char group[32];\n"

" snprintf(group, 32, \"%u\", 0);\n"

" struct group *gr;\n"

" snprintf(group, 32, \"%u\", gr->gr_gid);\n"

"}");

ASSERT_EQUALS("", errout.str());

}

void array_index_1() {

check("void f()\n"

"{\n"

" char str[0x10] = {0};\n"

" str[15] = 0;\n"

" str[16] = 0;\n"

"}");

ASSERT_EQUALS("[test.cpp:5]: (error) Array 'str[16]' accessed at index 16, which is out of bounds.\n", errout.str());

check("char f()\n"

"{\n"

" char str[16] = {0};\n"

" return str[16];\n"

"}");

ASSERT_EQUALS("[test.cpp:4]: (error) Array 'str[16]' accessed at index 16, which is out of bounds.\n", errout.str());

// test stack array

check("int f()\n"

"{\n"

" int x[ 3 ] = { 0, 1, 2 };\n"

" int y;\n"

" y = x[ 4 ];\n"

" return y;\n"

"}");

ASSERT_EQUALS("[test.cpp:5]: (error) Array 'x[3]' accessed at index 4, which is out of bounds.\n", errout.str());

check("int f()\n"

"{\n"

" int x[ 3 ] = { 0, 1, 2 };\n"

" int y;\n"

" y = x[ 2 ];\n"

" return y;\n"

"}");

ASSERT_EQUALS("", errout.str());

check("int x[5] = {0};\n"

"int a = x[10];");

ASSERT_EQUALS("[test.cpp:2]: (error) Array 'x[5]' accessed at index 10, which is out of bounds.\n", errout.str());

check("int x[5] = {0};\n"

"int a = (x)[10];");

ASSERT_EQUALS("[test.cpp:2]: (error) Array 'x[5]' accessed at index 10, which is out of bounds.\n", errout.str());

}

void array_index_2() {

check("void a(int i)\n" // valueflow

"{\n"

" char *str = new char[0x10];\n"

" str[i] = 0;\n"

"}\n"

"void b() { a(16); }");

TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Array 'str[16]' accessed at index 16, which is out of bounds.\n", "", errout.str());

}

void array_index_4() {

check("char c = \"abc\"[4];");

ASSERT_EQUALS("[test.cpp:1]: (error) Array '\"abc\"[4]' accessed at index 4, which is out of bounds.\n", errout.str());

check("p = &\"abc\"[4];");

ASSERT_EQUALS("", errout.str());

check("char c = \"\\0abc\"[2];");

ASSERT_EQUALS("", errout.str());

check("char c = L\"abc\"[4];");

ASSERT_EQUALS("[test.cpp:1]: (error) Array 'L\"abc\"[4]' accessed at index 4, which is out of bounds.\n", errout.str());

}

void array_index_3() {

check("void f()\n"

"{\n"

" int val[50];\n"

" int i, sum=0;\n"

" for (i = 0; i < 100; i++)\n"

" sum += val[i];\n"

"}");

ASSERT_EQUALS("[test.cpp:6]: (error) Array 'val[50]' accessed at index 99, which is out of bounds.\n", errout.str());

check("void f()\n"

"{\n"

" int val[50];\n"

" int i, sum=0;\n"

" for (i = 1; i < 100; i++)\n"

" sum += val[i];\n"

"}");

ASSERT_EQUALS("[test.cpp:6]: (error) Array 'val[50]' accessed at index 99, which is out of bounds.\n", errout.str());

check("void f(int a)\n"

"{\n"

" int val[50];\n"

" int i, sum=0;\n"

" for (i = a; i < 100; i++)\n"

" sum += val[i];\n"

"}");

ASSERT_EQUALS("[test.cpp:6]: (error) Array 'val[50]' accessed at index 99, which is out of bounds.\n", errout.str());

check("typedef struct g g2[3];\n"

"void foo(char *a)\n"

"{\n"

" for (int i = 0; i < 4; i++)\n"

" {\n"

" a[i]=0;\n"

" }\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void foo(int argc)\n"

"{\n"

" char a[2];\n"

" for (int i = 4; i < argc; i++){}\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void foo(int a[10]) {\n"

" for (int i=0;i<50;++i) {\n"

" a[i] = 0;\n"

" }\n"

"}");

ASSERT_EQUALS("[test.cpp:3]: (error) Array 'a[10]' accessed at index 49, which is out of bounds.\n", errout.str());

}

void array_index_6() {

check("struct ABC\n"

"{\n"

" char str[10];\n"

"};\n"

"\n"

"static void f()\n"

"{\n"

" struct ABC abc;\n"

" abc.str[10] = 0;\n"

"}");

ASSERT_EQUALS("[test.cpp:9]: (error) Array 'abc.str[10]' accessed at index 10, which is out of bounds.\n", errout.str());

check("struct ABC\n"

"{\n"

" char str[10];\n"

"};\n"

"\n"

"static char f()\n"

"{\n"

" struct ABC abc;\n"

" return abc.str[10];\n"

"}");

ASSERT_EQUALS("[test.cpp:9]: (error) Array 'abc.str[10]' accessed at index 10, which is out of bounds.\n", errout.str());

// This is not out of bounds because it is a variable length array

check("struct ABC\n"

"{\n"

" char str[1];\n"

"};\n"

"\n"

"static void f()\n"

"{\n"

" struct ABC* x = malloc(sizeof(struct ABC) + 10);\n"

" x->str[1] = 0;"

"}");

ASSERT_EQUALS("", errout.str());

// This is not out of bounds because it is not a variable length array

check("struct ABC\n"

"{\n"

" char str[1];\n"

" int x;\n"

"};\n"

"\n"

"static void f()\n"

"{\n"

" struct ABC* x = malloc(sizeof(struct ABC) + 10);\n"

" x->str[1] = 0;"

"}");

TODO_ASSERT_EQUALS("error", "", errout.str());

// This is not out of bounds because it is a variable length array

// and the index is within the memory allocated.

/** @todo this works by accident because we ignore any access to this array */

check("struct ABC\n"

"{\n"

" char str[1];\n"

"};\n"

"\n"

"static void f()\n"

"{\n"

" struct ABC* x = malloc(sizeof(struct ABC) + 10);\n"

" x->str[10] = 0;"

"}");

ASSERT_EQUALS("", errout.str());

// This is out of bounds because it is outside the memory allocated.

/** @todo this doesn't work because of a bug in sizeof(struct) */

check("struct ABC\n"

"{\n"

" char str[1];\n"

"};\n"

"\n"

"static void f()\n"

"{\n"

" struct ABC* x = malloc(sizeof(struct ABC) + 10);\n"

" x->str[11] = 0;"

"}");

TODO_ASSERT_EQUALS("[test.cpp:9]: (error) Array 'str[1]' accessed at index 11, which is out of bounds.\n", "", errout.str());

// This is out of bounds if 'sizeof(ABC)' is 1 (No padding)

check("struct ABC\n"

"{\n"

" char str[1];\n"

"};\n"

"\n"

"static void f()\n"

"{\n"

" struct ABC* x = malloc(sizeof(ABC) + 10);\n"

" x->str[11] = 0;"

"}");

TODO_ASSERT_EQUALS("error", "", errout.str());

// This is out of bounds because it is outside the memory allocated

/** @todo this doesn't work because of a bug in sizeof(struct) */

check("struct ABC\n"

"{\n"

" char str[1];\n"

"};\n"

"\n"

"static void f()\n"

"{\n"

" struct ABC* x = malloc(sizeof(struct ABC));\n"

" x->str[1] = 0;"

"}");

TODO_ASSERT_EQUALS("[test.cpp:9]: (error) Array 'str[1]' accessed at index 1, which is out of bounds.\n", "", errout.str());

// This is out of bounds because it is outside the memory allocated

// But only if 'sizeof(ABC)' is 1 (No padding)

check("struct ABC\n"

"{\n"

" char str[1];\n"

"};\n"

"\n"

"static void f()\n"

"{\n"

" struct ABC* x = malloc(sizeof(ABC));\n"

" x->str[1] = 0;"

"}");

TODO_ASSERT_EQUALS("error", "", errout.str());

// This is out of bounds because it is not a variable array

check("struct ABC\n"

"{\n"

" char str[1];\n"

"};\n"

"\n"

"static void f()\n"

"{\n"

" struct ABC x;\n"

" x.str[1] = 0;"

"}");

ASSERT_EQUALS("[test.cpp:9]: (error) Array 'x.str[1]' accessed at index 1, which is out of bounds.\n", errout.str());

check("struct foo\n"

"{\n"

" char str[10];\n"

"};\n"

"\n"

"void x()\n"

"{\n"

" foo f;\n"

" for ( unsigned int i = 0; i < 64; ++i )\n"

" f.str[i] = 0;\n"

"}");

ASSERT_EQUALS("[test.cpp:10]: (error) Array 'f.str[10]' accessed at index 63, which is out of bounds.\n", errout.str());

check("struct AB { char a[NUM]; char b[NUM]; }\n"

"void f(struct AB *ab) {\n"

" ab->a[0] = 0;\n"

"}");

ASSERT_EQUALS("", errout.str());

check("union { char a[1]; int b; } ab;\n"

"void f() {\n"

" ab.a[2] = 0;\n"

"}");

ASSERT_EQUALS("[test.cpp:3]: (error) Array 'ab.a[1]' accessed at index 2, which is out of bounds.\n", errout.str());

}

void array_index_7() {

check("struct ABC\n"

"{\n"

" char str[10];\n"

"};\n"

"\n"

"static void f(struct ABC *abc)\n"

"{\n"

" abc->str[10] = 0;\n"

"}");

ASSERT_EQUALS("[test.cpp:8]: (error) Array 'abc->str[10]' accessed at index 10, which is out of bounds.\n", errout.str());

}

void array_index_11() {

check("class ABC\n"

"{\n"

"public:\n"

" ABC();\n"

" char *str[10];\n"

" struct ABC *next();\n"

"};\n"

"\n"

"static void f(ABC *abc1)\n"

"{\n"

" for ( ABC *abc = abc1; abc; abc = abc->next() )\n"

" {\n"

" abc->str[10] = 0;\n"

" }\n"

"}");

ASSERT_EQUALS("[test.cpp:13]: (error) Array 'abc->str[10]' accessed at index 10, which is out of bounds.\n", errout.str());

}

void array_index_12() {

check("class Fred\n"

"{\n"

"private:\n"

" char str[10];\n"

"public:\n"

" Fred();\n"

"};\n"

"Fred::Fred()\n"

"{\n"

" str[10] = 0;\n"

"}");

ASSERT_EQUALS("[test.cpp:10]: (error) Array 'str[10]' accessed at index 10, which is out of bounds.\n", errout.str());

check("class Fred\n"

"{\n"

"private:\n"

" char str[10];\n"

"public:\n"

" char c();\n"

"};\n"

"char Fred::c()\n"

"{\n"

" return str[10];\n"

"}");

ASSERT_EQUALS("[test.cpp:10]: (error) Array 'str[10]' accessed at index 10, which is out of bounds.\n", errout.str());

}

void array_index_13() {

check("void f()\n"

"{\n"

" char buf[10];\n"

" for (int i = 0; i < 100; i++)\n"

" {\n"

" if (i < 10)\n"

" int x = buf[i];\n"

" }\n"

"}");

ASSERT_EQUALS("", errout.str());

}

void array_index_14() {

check("void f()\n"

"{\n"

" int a[10];\n"

" for (int i = 0; i < 10; i++)\n"

" a[i+10] = i;\n"

"}");

ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' accessed at index 19, which is out of bounds.\n", errout.str());

}

void array_index_15() {

check("void f()\n"

"{\n"

" int a[10];\n"

" for (int i = 0; i < 10; i++)\n"

" a[10+i] = i;\n"

"}");

ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' accessed at index 19, which is out of bounds.\n", errout.str());

}

void array_index_16() {

check("void f()\n"

"{\n"

" int a[10];\n"

" for (int i = 0; i < 10; i++)\n"

" a[i+1] = i;\n"

"}");

ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' accessed at index 10, which is out of bounds.\n", errout.str());

}

void array_index_17() {

check("void f()\n"

"{\n"

" int a[10];\n"

" for (int i = 0; i < 10; i++)\n"

" a[i*2] = i;\n"

"}");

ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[10]' accessed at index 18, which is out of bounds.\n", errout.str());

check("void f()\n"

"{\n"

" int a[12];\n"

" for (int i = 0; i < 12; i+=6)\n"

" a[i+5] = i;\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f()\n"

"{\n"

" int a[12];\n"

" for (int i = 0; i < 12; i+=6)\n"

" a[i+6] = i;\n"

"}");

ASSERT_EQUALS("[test.cpp:5]: (error) Array 'a[12]' accessed at index 12, which is out of bounds.\n", errout.str());

check("void f() {\n" // #4398

" int a[2];\n"

" for (int i = 0; i < 4; i+=2)\n"

" a[i] = 0;\n"

"}");

ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2]' accessed at index 2, which is out of bounds.\n", errout.str());

check("void f() {\n" // #4398

" int a[2];\n"

" for (int i = 0; i < 4; i+=2)\n"

" do_stuff(a+i);\n"

"}");

ASSERT_EQUALS("", errout.str());

}

void array_index_18() {

check("void f()\n"

"{\n"

" int a[5];\n"

" for (int i = 0; i < 6; i++)\n"

" {\n"

" a[i] = i;\n"

" i+=1;\n"

" }\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f()\n"

"{\n"

" int a[5];\n"

" for (int i = 0; i < 6; i++)\n"

" {\n"

" a[i] = i;\n"

" i++;\n"

" }\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f()\n"

"{\n"

" int a[5];\n"

" for (int i = 0; i < 6; i++)\n"

" {\n"

" a[i] = i;\n"

" ++i;\n"

" }\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f()\n"

"{\n"

" int a[5];\n"

" for (int i = 0; i < 6; i++)\n"

" {\n"

" a[i] = i;\n"

" i=4;\n"

" }\n"

"}");

ASSERT_EQUALS("", errout.str());

check("void f()\n"

"{\n"

" int a[6];\n"

" for (int i = 0; i < 7; i++)\n"

" {\n"

" a[i] = i;\n"

" i+=1;\n"

" }\n"

"}");

TODO_ASSERT_EQUALS("[test.cpp:6]: (error) Buffer overrun\n", "", errout.str());

}

void array_index_19() {

// "One Past the End" is legal, as long as pointer is not dereferenced.

check("void f()\n"

"{\n"

" char a[2];\n"

" char *end = &(a[2]);\n"

"}");

ASSERT_EQUALS("", errout.str());

// Getting more than one past the end is not legal

check("void f()\n"

"{\n"

" char a[2];\n"

" char *end = &(a[3]);\n"

"}");

ASSERT_EQUALS("[test.cpp:4]: (error) Array 'a[2]' accessed at index 3, which is out of bounds.\n", errout.str());

}

void array_index_20() {

check("void f()\n"

"{\n"

" char a[8];\n"

" int b[10];\n"

" for ( int i = 0; i < 9; i++ )\n"

" b[i] = 0;\n"

"}");

ASSERT_EQUALS("", errout.str());

}

void array_index_21() {

check("class A {\n"

" int indices[2];\n"

" void foo(int indices[3]);\n"

"};\n"

"\n"

"void A::foo(int indices[3]) {\n"

" for(int j=0; j<3; ++j) {\n"

" int b = indices[j];\n"

" }\n"

"}");

ASSERT_EQUALS("", errout.str());

}

void array_index_22() {

check("int main() {\n"

" size_t indices[2];\n"

" int b = indices[2];\n"

"}");

ASSERT_EQUALS("[test.cpp:3]: (error) Array 'indices[2]' accessed at index 2, which is out of bounds.\n", errout.str());

}

void array_index_23() {

check("void foo()\n"

"{\n"

" char c[10];\n"

" c[1<<23]='a';\n"

"}");

ASSERT_EQUALS("[test.cpp:4]: (error) Array 'c[10]' accessed at index 8388608, which is out of bounds.\n", errout.str());

}

void array_index_24() {

// ticket #1492 and #1539

const std::string charMaxPlusOne(settings0.defaultSign == 'u' ? "256" : "128");

check(("void f(char n) {\n"

" int a[n];\n" // n <= CHAR_MAX

" a[-1] = 0;\n" // negative index

" a[" + charMaxPlusOne + "] = 0;\n" // 128/256 > CHAR_MAX

"}\n").c_str());

ASSERT_EQUALS("[test.cpp:3]: (error) Array 'a[" + charMaxPlusOne + "]' accessed at index -1, which is out of bounds.\n"

"[test.cpp:4]: (error) Array 'a[" + charMaxPlusOne + "]' accessed at index " + charMaxPlusOne + ", which is out of bounds.\n", errout.str());

check("void f(signed char n) {\n"

" int a[n];\n" // n <= SCHAR_MAX

" a[-1] = 0;\n" // negative index

" a[128] = 0;\n" // 128 > SCHAR_MAX

"}");

ASSERT_EQUALS("[test.cpp:3]: (error) Array 'a[128]' accessed at index -1, which is out of bounds.\n"

"[test.cpp:4]: (error) Array 'a[128]' accessed at index 128, which is out of bounds.\n", errout.str());

check("void f(unsigned char n) {\n"

" int a[n];\n" // n <= UCHAR_MAX

" a[-1] = 0;\n" // negative index

" a[256] = 0;\n" // 256 > UCHAR_MAX

"}");

ASSERT_EQUALS("[test.cpp:3]: (error) Array 'a[256]' accessed at index -1, which is out of bounds.\n"

"[test.cpp:4]: (error) Array 'a[256]' accessed at index 256, which is out of bounds.\n", errout.str());

check("void f(short n) {\n"

" int a[n];\n" // n <= SHRT_MAX

" a[-1] = 0;\n" // negative index

" a[32768] = 0;\n" // 32768 > SHRT_MAX

"}");

ASSERT_EQUALS("[test.cpp:3]: (error) Array 'a[32768]' accessed at index -1, which is out of bounds.\n"

"[test.cpp:4]: (error) Array 'a[32768]' accessed at index 32768, which is out of bounds.\n", errout.str());

check("void f(unsigned short n) {\n"

" int a[n];\n" // n <= USHRT_MAX

" a[-1] = 0;\n" // negative index

" a[65536] = 0;\n" // 65536 > USHRT_MAX

"}");

ASSERT_EQUALS("[test.cpp:3]: (error) Array 'a[65536]' accessed at index -1, which is out of bounds.\n"

"[test.cpp:4]: (error) Array 'a[65536]' accessed at index 65536, which is out of bounds.\n", errout.str());

check("void f(signed short n) {\n"

" int a[n];\n" // n <= SHRT_MAX

" a[-1] = 0;\n" // negative index

" a[32768] = 0;\n" // 32768 > SHRT_MAX

"}");

ASSERT_EQUALS("[test.cpp:3]: (error) Array 'a[32768]' accessed at index -1, which is out of bounds.\n"

"[test.cpp:4]: (error) Array 'a[32768]' accessed at index 32768, which is out of bounds.\n", errout.str());

check("void f(int n) {\n"

" int a[n];\n" // n <= INT_MAX

" a[-1] = 0;\n" // negative index

"}");

ASSERT_EQUALS("[test.cpp:3]: (error) Array 'a[2147483648]' accessed at index -1, which is out of bounds.\n", errout.str());

check("void f(unsigned int n) {\n"

" int a[n];\n" // n <= UINT_MAX

" a[-1] = 0;\n" // negative index

"}");

ASSERT_EQUALS("[test.cpp:3]: (error) Array 'a[4294967296]' accessed at index -1, which is out of bounds.\n", errout.str());

check("void f(signed int n) {\n"

" int a[n];\n" // n <= INT_MAX

" a[-1] = 0;\n" // negative index

"}");

ASSERT_EQUALS("[test.cpp:3]: (error) Array 'a[2147483648]' accessed at index -1, which is out of bounds.\n", errout.str());

}

void array_index_25() { // #1536

check("void foo()\n"