[FFmpeg-devel] [PATCH 3/3] avformat/mov: Fix overflow in corrected_dts

[Michael Niedermayer]

This fix doesnt feel optimal, better fix is welcome

Fixes: signed integer overflow: -9223091047224049440 + -281474976645120 cannot be represented in type 'long long'
Fixes: 376128123/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-4533016505942016

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/mov.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 3cfcade4d82..f08834417df 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -3533,7 +3533,7 @@ static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
             av_log(c->fc, AV_LOG_WARNING, "Too large sample offset %u in stts entry %u with count %u in st:%d. Clipping to 1.\n",
                    sample_duration, i, sample_count, st->index);
             sc->stts_data[i].duration = 1;
-            corrected_dts += (delta_magnitude < 0 ? (int64_t)delta_magnitude : 1) * sample_count;
+            corrected_dts += (delta_magnitude < 0 ? (uint64_t)delta_magnitude : 1) * sample_count;
         } else {
             corrected_dts += sample_duration * (uint64_t)sample_count;
         }
-- 
2.47.0