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avformat/iamfdec: Check nb_layers before dereferencing layer

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Fixes: dereferencing pointers near NULL
Fixes: 70432/clusterfuzz-testcase-minimized-ffmpeg_dem_IAMF_fuzzer-5255672845893632
Fixes: 70877/clusterfuzz-testcase-minimized-ffmpeg_dem_IAMF_fuzzer-5348547432611840

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer 2024-07-16 23:19:58 +02:00
parent 6996e1238e
commit d7f83fc2f4
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1 changed files with 1 additions and 1 deletions
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libavformat/iamfdec.c
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@ -107,7 +107,7 @@ static int iamf_read_header(AVFormatContext *s)
if (ret < 0)
return ret;
if (!i && !j && audio_element->layers[0].substream_count == 1)
if (!i && !j && audio_element->nb_layers && audio_element->layers[0].substream_count == 1)
st->disposition |= AV_DISPOSITION_DEFAULT;
else
st->disposition |= AV_DISPOSITION_DEPENDENT;