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avformat/mvi: Use 64bit for testing dimensions

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Fixes: signed integer overflow: 65535 * 65535 cannot be represented in type 'int'
Fixes: 26910/clusterfuzz-testcase-minimized-ffmpeg_dem_MVI_fuzzer-6649291124899840

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 2021-01-16 22:20:37 +01:00
parent 29851cb840
commit 48fb752767
1 changed files with 1 additions and 1 deletions
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libavformat/mvi.c
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@ -94,7 +94,7 @@ static int read_header(AVFormatContext *s)
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codecpar->codec_id = AV_CODEC_ID_MOTIONPIXELS; vst->codecpar->codec_id = AV_CODEC_ID_MOTIONPIXELS;
mvi->get_int = (vst->codecpar->width * vst->codecpar->height < (1 << 16)) ? avio_rl16 : avio_rl24; mvi->get_int = (vst->codecpar->width * (int64_t)vst->codecpar->height < (1 << 16)) ? avio_rl16 : avio_rl24;
mvi->audio_frame_size = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count; mvi->audio_frame_size = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count;
if (mvi->audio_frame_size <= 1 << MVI_FRAC_BITS - 1) { if (mvi->audio_frame_size <= 1 << MVI_FRAC_BITS - 1) {