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AK: Don't crash on invalid Base64 input

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In the long-term, we should probably have a way to signal decoding
failure. For now, it should suffice to at least not crash. This is
particularly relevant because apparently this can be triggered while
parsing a PEM certificate, which happens during every TLS connection.

Found by OSS Fuzz
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=38979
This commit is contained in:
Ben Wiederhake 2021-10-22 23:17:54 +02:00 committed by Linus Groh
parent 20f73d2abc
commit 3bf1f7ae87
Notes: sideshowbarker 2024-07-18 03:20:18 +09:00 
Author: https://github.com/BenWiederhake
Commit: https://github.com/SerenityOS/serenity/commit/3bf1f7ae874
Pull-request: https://github.com/SerenityOS/serenity/pull/10590
Reviewed-by: https://github.com/linusg
2 changed files with 9 additions and 1 deletions
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2
AK/Base64.cpp
View file

@ -61,7 +61,7 @@ ByteBuffer decode_base64(const StringView& input)
*is_padding = true;
return 0;
}
return table[input[offset]];
return table[static_cast<unsigned char>(input[offset])];
};
Vector<u8> output;

8
Tests/AK/TestBase64.cpp
View file

@ -27,6 +27,14 @@ TEST_CASE(test_decode)
decode_equal("Zm9vYmFy", "foobar");
}
TEST_CASE(test_decode_nocrash)
{
// Any output is fine, we only check that we don't crash here.
decode_base64(StringView("asdf\xffqwer"));
decode_base64(StringView("asdf\x80qwer"));
// TODO: Handle decoding failure.
}
TEST_CASE(test_encode)
{
auto encode_equal = [&](const char* input, const char* expected) {