[FFmpeg-cvslog] avformat/mxfdec: Check body_offset
Michael Niedermayer
git at videolan.org
Wed May 22 23:15:14 EEST 2024
ffmpeg | branch: release/7.0 | Michael Niedermayer <michael at niedermayer.cc> | Fri Apr 26 03:46:33 2024 +0200| [0e44de3b9b5c7dc99b47c30d24932d9856d3b646] | committer: Michael Niedermayer
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 at haerdin.se>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 20a6bfda0f7c6447ac94611736cee6e9ce6972a0)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0e44de3b9b5c7dc99b47c30d24932d9856d3b646
---
libavformat/mxfdec.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
index 4e4beb40b0..518a507539 100644
--- a/libavformat/mxfdec.c
+++ b/libavformat/mxfdec.c
@@ -790,6 +790,9 @@ 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;
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