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avoid OOB reads in path_is_sane
This commit is contained in:
Sergio R. Caprile
2026-06-23 13:05:25 -03:00
committed by GitHub
parent 044fdd472f b55de8b151
commit 60bfa45656
3 changed files with 31 additions and 13 deletions
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src/util.c
+9 -6
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@@ -143,13 +143,16 @@ int mg_check_ip_acl(struct mg_str acl, struct mg_addr *remote_ip) {
bool mg_path_is_sane(const struct mg_str path) {
const char *s = path.buf;
size_t n = path.len;
if (path.buf[0] == '~') return false; // Starts with ~
if (path.buf[0] == '.' && path.buf[1] == '.') return false; // Starts with ..
for (; s[0] != '\0' && n > 0; s++, n--) {
if ((s[0] == '/' || s[0] == '\\') && n >= 2) { // Subdir?
if (s[1] == '.' && s[2] == '.') return false; // Starts with ..
}
if (n == 0 || path.buf[0] == '\0') return true;
if (s[0] == '~') return false; // Starts with ~
if (s[0] == '.' && n > 1 && s[1] == '.')
return false; // Starts with ..
for (; n > 0 && s[0] != '\0'; s++, n--) {
if ((s[0] == '/' || s[0] == '\\') && n >= 2 && s[1] == '.' && n > 2 &&
s[2] == '.')
return false; // Subdir starts with ..
}
if (n > 0) return false; // embedded nul (terminator not counted in len)
return true;
}