[FFmpeg-cvslog] avformat/mov: check for pts overflow in mov_read_sidx()

[Michael Niedermayer]

ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Thu Apr 15 18:43:25 2021 +0200| [26369e6ca993796ab054270a1bb685583e7c7eb9] | committer: Michael Niedermayer

avformat/mov: check for pts overflow in mov_read_sidx()

Fixes: signed integer overflow: 9223372036846336888 + 4278255871 cannot be represented in type 'long'
Fixes: 32782/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-6059216516284416

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit ee53bb2399d8f387ac93a18ba0600ca7b04ac634)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=26369e6ca993796ab054270a1bb685583e7c7eb9
---

 libavformat/mov.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 38a70589be..cd56df5b29 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -5124,7 +5124,9 @@ static int mov_read_sidx(MOVContext *c, AVIOContext *pb, MOVAtom atom)
         if (frag_stream_info)
             frag_stream_info->sidx_pts = timestamp;
 
-        if (av_sat_add64(offset, size) != offset + size)
+        if (av_sat_add64(offset, size) != offset + size ||
+            av_sat_add64(pts, duration) != pts + (uint64_t)duration
+        )
             return AVERROR_INVALIDDATA;
         offset += size;
         pts += duration;