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| author | Michael Niedermayer <michael@niedermayer.cc> | 2021-01-21 21:41:41 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-10-09 22:02:20 +0200 |
| commit | 95671d383f52908f4bcfcd8c7b4dc1c76ed3f8dc (patch) | |
| tree | 18d9e2b29c28e952d6f8e35ab19af4f2f2cf458f | |
| parent | d558c0cae0ee861e6d86eedca0f27a70b7c929c4 (diff) | |
| download | ffmpeg-95671d383f52908f4bcfcd8c7b4dc1c76ed3f8dc.tar.gz | |
avformat/mxfdec: Fix integer overflow in next position in mxf_read_local_tags()
Fixes: signed integer overflow: 9223372036854775723 + 8192 cannot be represented in type 'long'
Fixes: 29072/clusterfuzz-testcase-minimized-ffmpeg_dem_MXF_fuzzer-4812604904177664
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 d3d9b1fc8e2dfc8b4d66c9916ab7221062ff4660)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/mxfdec.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c index dd4b02efa1..68e9d21e86 100644 --- a/libavformat/mxfdec.c +++ b/libavformat/mxfdec.c @@ -2431,8 +2431,11 @@ static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadF int ret; int tag = avio_rb16(pb); int size = avio_rb16(pb); /* KLV specified by 0x53 */ - uint64_t next = avio_tell(pb) + size; + int64_t next = avio_tell(pb); UID uid = {0}; + if (next < 0 || next > INT64_MAX - size) + return next < 0 ? next : AVERROR_INVALIDDATA; + next += size; av_log(mxf->fc, AV_LOG_TRACE, "local tag %#04x size %d\n", tag, size); if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */ |