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avformat/mxfdec: Check size for shrinking 

av_shrink_packet() takes int size, so size must fit in int
Fixes: out of array access
Fixes: 35607/clusterfuzz-testcase-minimized-ffmpeg_dem_MXF_fuzzer-4875541323841536

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 65b862ab59)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-07-11 12:39:34 +02:00
parent 796a84fd04
commit 6d72fc6be2
1 changed files with 1 additions and 1 deletions
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libavformat/mxfdec.c
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@ -600,7 +600,7 @@ static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
// enc. code // enc. code
size = klv_decode_ber_length(pb); size = klv_decode_ber_length(pb);
if (size < 32 || size - 32 < orig_size) if (size < 32 || size - 32 < orig_size || (int)orig_size != orig_size)
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
avio_read(pb, ivec, 16); avio_read(pb, ivec, 16);
avio_read(pb, tmpbuf, 16); avio_read(pb, tmpbuf, 16);