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avformat/icodec: Check nb_pal

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Fixes: signed integer overflow: 538976288 * 4 cannot be represented in type 'int'
Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_ICO_fuzzer-6690068904935424

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer 2022-09-17 23:15:56 +02:00
parent 9303ba272e
commit db73ae0dc1
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1 changed files with 3 additions and 0 deletions
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libavformat/icodec.c
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@ -196,6 +196,9 @@ static int read_packet(AVFormatContext *s, AVPacket *pkt)
AV_WL32(buf + 32, image->nb_pal);
}
if (image->nb_pal > INT_MAX / 4 - 14 - 40)
return AVERROR_INVALIDDATA;
AV_WL32(buf - 4, 14 + 40 + image->nb_pal * 4);
AV_WL32(buf + 8, AV_RL32(buf + 8) / 2);
}