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Add integer overflow checks to URL escape allocation functions #615

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Add integer overflow checks to URL escape allocation functions #615

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Add integer overflow checks to URL escape allocation functions
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@kodareef5
kodareef5 committed Apr 8, 2026
commit dbd148598f811d93d31bc55b6ebdb161dc76c700
24 changes: 18 additions & 6 deletions server/util.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1816,8 +1816,10 @@ AP_DECLARE(char *) ap_escape_shell_cmd(apr_pool_t *p, const char *str)
char *cmd;
unsigned char *d;
const unsigned char *s;
apr_size_t len = strlen(str);

cmd = apr_palloc(p, 2 * strlen(str) + 1); /* Be safe */
ap_assert(len <= (APR_SIZE_MAX - 1) / 2);
cmd = apr_palloc(p, 2 * len + 1);
d = (unsigned char *)cmd;
s = (const unsigned char *)str;
for (; *s; ++s) {
Expand Down Expand Up @@ -2073,7 +2075,9 @@ AP_DECLARE(char *) ap_escape_path_segment_buffer(char *copy, const char *segment

AP_DECLARE(char *) ap_escape_path_segment(apr_pool_t *p, const char *segment)
{
return ap_escape_path_segment_buffer(apr_palloc(p, 3 * strlen(segment) + 1), segment);
apr_size_t len = strlen(segment);
ap_assert(len <= (APR_SIZE_MAX - 1) / 3);
return ap_escape_path_segment_buffer(apr_palloc(p, 3 * len + 1), segment);
}

AP_DECLARE(char *) ap_os_escape_path(apr_pool_t *p, const char *path, int partial)
Expand All @@ -2082,11 +2086,17 @@ AP_DECLARE(char *) ap_os_escape_path(apr_pool_t *p, const char *path, int partia
* Allocate another +1 to allow the caller to add a trailing '/' (see
* comment in 'ap_sub_req_lookup_dirent')
*/
char *copy = apr_palloc(p, 3 * strlen(path) + 3 + 1);
const unsigned char *s = (const unsigned char *)path;
unsigned char *d = (unsigned char *)copy;
apr_size_t len = strlen(path);
char *copy;
const unsigned char *s;
unsigned char *d;
unsigned c;

ap_assert(len <= (APR_SIZE_MAX - 4) / 3);
copy = apr_palloc(p, 3 * len + 3 + 1);
s = (const unsigned char *)path;
d = (unsigned char *)copy;

if (!partial) {
const char *colon = ap_strchr_c(path, ':');
const char *slash = ap_strchr_c(path, '/');
Expand Down Expand Up @@ -2133,7 +2143,9 @@ AP_DECLARE(char *) ap_escape_urlencoded_buffer(char *copy, const char *buffer)

AP_DECLARE(char *) ap_escape_urlencoded(apr_pool_t *p, const char *buffer)
{
return ap_escape_urlencoded_buffer(apr_palloc(p, 3 * strlen(buffer) + 1), buffer);
apr_size_t len = strlen(buffer);
ap_assert(len <= (APR_SIZE_MAX - 1) / 3);
return ap_escape_urlencoded_buffer(apr_palloc(p, 3 * len + 1), buffer);
}

/* ap_escape_uri is now a macro for os_escape_path */
Expand Down