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avformat/id3v2: Sanity check tlen before alloc and uncompress

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Fixes: Timeout (>20sec -> 65ms)
Fixes: 26896/clusterfuzz-testcase-minimized-ffmpeg_dem_DAUD_fuzzer-5691024049176576
Fixes: 27627/clusterfuzz-testcase-minimized-ffmpeg_dem_AEA_fuzzer-4907019324358656

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-11-07 21:39:21 +01:00
parent 7025c91d07
commit d7f87a4b9e
1 changed files with 3 additions and 0 deletions
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3
libavformat/id3v2.c
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@ -993,6 +993,9 @@ static void id3v2_parse(AVIOContext *pb, AVDictionary **metadata,
av_log(s, AV_LOG_DEBUG, "Compresssed frame %s tlen=%d dlen=%ld\n", tag, tlen, dlen);
if (tlen <= 0)
goto seek;
av_fast_malloc(&uncompressed_buffer, &uncompressed_buffer_size, dlen);
if (!uncompressed_buffer) {
av_log(s, AV_LOG_ERROR, "Failed to alloc %ld bytes\n", dlen);