From 35fa525f4ee43b92082fdb38013eb7eb1edf23a9 Mon Sep 17 00:00:00 2001
From: chrchr-github <noreply@github.com>
Date: Sun, 21 Jun 2026 14:27:08 +0200
Subject: [PATCH 1/2] Fix  #14866 FP bufferAccessOutOfBounds with vector and
 gethostname()

---
 lib/checkbufferoverrun.cpp | 2 +-
 test/testbufferoverrun.cpp | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/checkbufferoverrun.cpp b/lib/checkbufferoverrun.cpp
index 8be9b508849..5b3e6b294b4 100644
--- a/lib/checkbufferoverrun.cpp
+++ b/lib/checkbufferoverrun.cpp
@@ -574,7 +574,7 @@ ValueFlow::Value CheckBufferOverrunImpl::getBufferSize(const Token *bufTok) cons
             return *value;
     }
 
-    if (!var || var->isPointer())
+    if (!var || var->isPointer() || (astIsContainer(bufTok) && var->getTypeName() != "std::array"))
         return ValueFlow::Value(-1);
 
     const MathLib::bigint dim = std::accumulate(var->dimensions().cbegin(), var->dimensions().cend(), MathLib::bigint(1), [](MathLib::bigint i1, const Dimension &dim) {
diff --git a/test/testbufferoverrun.cpp b/test/testbufferoverrun.cpp
index 1a03ca336f8..2d4c73e6474 100644
--- a/test/testbufferoverrun.cpp
+++ b/test/testbufferoverrun.cpp
@@ -3539,6 +3539,12 @@ class TestBufferOverrun : public TestFixture {
                            "[test.cpp:7:12]: (error) Buffer is accessed out of bounds: &a[0][0] [bufferAccessOutOfBounds]\n",
                            "",
                            errout_str());
+
+        check("void f() {\n"
+              "    std::vector<char> buf(25);\n"
+              "    std::memset(&buf[0], 0, 25);\n"
+              "}\n");
+        ASSERT_EQUALS("", errout_str());
     }
 
     void buffer_overrun_errorpath() {

From 34c207c612c59a691803466275aecb6aa7b8d5a4 Mon Sep 17 00:00:00 2001
From: chrchr-github <78114321+chrchr-github@users.noreply.github.com>
Date: Mon, 22 Jun 2026 08:39:31 +0200
Subject: [PATCH 2/2] Add comment [skip ci]

---
 test/testbufferoverrun.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/testbufferoverrun.cpp b/test/testbufferoverrun.cpp
index 2d4c73e6474..e1da77ccbfb 100644
--- a/test/testbufferoverrun.cpp
+++ b/test/testbufferoverrun.cpp
@@ -3540,7 +3540,7 @@ class TestBufferOverrun : public TestFixture {
                            "",
                            errout_str());
 
-        check("void f() {\n"
+        check("void f() {\n" // #14866
               "    std::vector<char> buf(25);\n"
               "    std::memset(&buf[0], 0, 25);\n"
               "}\n");