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avformat/mxfdec: Check body_offset 

Fixes: signed integer overflow: 538976288 - -9223372036315799520 cannot be represented in type 'long'
Fixes: 68060/clusterfuzz-testcase-minimized-ffmpeg_dem_MXF_fuzzer-5523457266745344

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Tomas Härdin <git@haerdin.se>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-04-26 03:46:33 +02:00
parent c26a762ea1
commit 20a6bfda0f
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1 changed files with 3 additions and 0 deletions
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libavformat/mxfdec.c
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@ -791,6 +791,9 @@ static int mxf_read_partition_pack(void *arg, AVIOContext *pb, int tag, int size
partition->index_sid = avio_rb32(pb);
partition->body_offset = avio_rb64(pb);
partition->body_sid = avio_rb32(pb);
if (partition->body_offset < 0)
return AVERROR_INVALIDDATA;
if (avio_read(pb, op, sizeof(UID)) != sizeof(UID)) {
av_log(mxf->fc, AV_LOG_ERROR, "Failed reading UID\n");
return AVERROR_INVALIDDATA;