[FFmpeg-devel] [PATCH 4/7] avformat/mxfdec: Check timecode for overflow

[Michael Niedermayer]

Fixes: signed integer overflow: 9223372036840103968 + 538976288 cannot be represented in type 'long'
Fixes: 70604/clusterfuzz-testcase-minimized-ffmpeg_dem_MXF_fuzzer-4844090340999168

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavformat/mxfdec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
index ac63c0d5add..8eae9f87afa 100644
--- a/libavformat/mxfdec.c
+++ b/libavformat/mxfdec.c
@@ -2391,6 +2391,9 @@ static int mxf_parse_physical_source_package(MXFContext *mxf, MXFTrack *source_t
                                               physical_track->edit_rate,
                                               source_track->edit_rate);
 
+                if (av_sat_add64(start_position, mxf_tc->start_frame) != start_position + (uint64_t)mxf_tc->start_frame)
+                    continue;
+
                 if (av_timecode_init(&tc, mxf_tc->rate, flags, start_position + mxf_tc->start_frame, mxf->fc) == 0) {
                     mxf_add_timecode_metadata(&st->metadata, "timecode", &tc);
                     return 0;
-- 
2.46.0