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Merge pull request #419 from phcoder/overflow

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love: Fix buffer overflow
This commit is contained in:
Rob Loach 2022-05-13 18:01:58 -04:00 committed by GitHub
commit ca1f6e2bed
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1 changed files with 11 additions and 3 deletions
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14
src/love/data.cpp
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@ -153,9 +153,14 @@ std::string data::hash_md5(const std::string& data) {
MD5_Final(digest, &context);
// Construct the MD5 hash string.
char md5string[33];
char md5string[33+8];
for (int i = 0; i < 16; ++i) {
snprintf(&md5string[i * 2], sizeof(&md5string[i * 2]), "%02x", (unsigned int)digest[i]);
/*
sizeof(&md5string[i * 2]) is a sizeof of a pointer, so 4 or 8
instead of intended 3 (2 hex digits + \0) leading
to a potential overflow
*/
snprintf(&md5string[i * 2], 3, "%02x", (unsigned int)digest[i]); /* NOLINT(runtime/printf). */
}
// Output the hash.
@ -169,7 +174,10 @@ std::string data::hash_sha1(const std::string& data) {
uint32_t digest[5];
s.getDigest(digest);
char tmp[48];
snprintf(tmp, sizeof(tmp), "%08x%08x%08x%08x%08x", digest[0], digest[1], digest[2], digest[3], digest[4]);
snprintf(tmp, sizeof(tmp), "%08x%08x%08x%08x%08x",
(unsigned int) digest[0], (unsigned int) digest[1],
(unsigned int) digest[2], (unsigned int) digest[3],
(unsigned int) digest[4]);
return std::string(tmp);
}