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avformat/id3v2: Check against max compression ratio before allocation

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Fixes: Timeout (>10sec -> 12ms)
Fixes: 27612/clusterfuzz-testcase-minimized-ffmpeg_dem_PCM_S24BE_fuzzer-6605893000757248

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 2020-11-28 23:43:23 +01:00
parent 7d7ae68972
commit c48110a4a4
1 changed files with 2 additions and 0 deletions
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2
libavformat/id3v2.c
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@ -995,6 +995,8 @@ static void id3v2_parse(AVIOContext *pb, AVDictionary **metadata,
if (tlen <= 0)
goto seek;
if (dlen / 32768 > tlen)
goto seek;
av_fast_malloc(&uncompressed_buffer, &uncompressed_buffer_size, dlen);
if (!uncompressed_buffer) {