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avformat/mxfdec: Check index_edit_rate 

Fixes: Assertion b >=0 failed at libavutil/mathematics.c:62
Fixes: 67811/clusterfuzz-testcase-minimized-ffmpeg_dem_MXF_fuzzer-5108429687422976

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit ed49391961)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-04-04 00:38:20 +02:00
parent c657698796
commit 2bcd3136b3
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1 changed files with 3 additions and 0 deletions
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libavformat/mxfdec.c
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@ -938,6 +938,9 @@ static int mxf_read_index_table_segment(void *arg, AVIOContext *pb, int tag, int
case 0x3F0B:
segment->index_edit_rate.num = avio_rb32(pb);
segment->index_edit_rate.den = avio_rb32(pb);
if (segment->index_edit_rate.num <= 0 ||
segment->index_edit_rate.den <= 0)
return AVERROR_INVALIDDATA;
av_log(NULL, AV_LOG_TRACE, "IndexEditRate %d/%d\n", segment->index_edit_rate.num,
segment->index_edit_rate.den);
break;