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avformat/mvi: Check count for overflow

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Fixes: left shift of 21378748 by 10 places cannot be represented in type 'int'
Fixes: 26449/clusterfuzz-testcase-minimized-ffmpeg_dem_MVI_fuzzer-5680463374712832

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 2020-10-19 17:39:30 +02:00
parent 6965ade54c
commit a413ed9863
1 changed files with 2 additions and 0 deletions
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2
libavformat/mvi.c
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@ -123,6 +123,8 @@ static int read_packet(AVFormatContext *s, AVPacket *pkt)
count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS;
if (count > mvi->audio_size_left)
count = mvi->audio_size_left;
if ((int64_t)count << MVI_FRAC_BITS > INT_MAX)
return AVERROR_INVALIDDATA;
if ((ret = av_get_packet(pb, pkt, count)) < 0)
return ret;
pkt->stream_index = MVI_AUDIO_STREAM_INDEX;