[FFmpeg-cvslog] avformat/mov: Check dts for overflow in mov_read_trun()

[Michael Niedermayer]

ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Thu Aug 26 13:37:27 2021 +0200| [3d5f361290abcc16f6b003bab6ad84ad05aad2b0] | committer: Michael Niedermayer

avformat/mov: Check dts for overflow in mov_read_trun()

Fixes: signed integer overflow: 9223372034248226491 + 3275247799 cannot be represented in type 'long'
Fixes: clusterfuzz-testcase-minimized-audio_decoder_fuzzer-4538729166077952

Reported-by: Matt Wolenetz <wolenetz at google.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 4de4bc06fdfd0383f3d9012c6557a38408a09d28)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3d5f361290abcc16f6b003bab6ad84ad05aad2b0
---

 libavformat/mov.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index b49dd01543..a7a31dada1 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -4992,6 +4992,8 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
                 "size %u, distance %d, keyframe %d\n", st->index,
                 index_entry_pos, offset, dts, sample_size, distance, keyframe);
         distance++;
+        if (av_sat_add64(dts, sample_duration) != dts + (uint64_t)sample_duration)
+            return AVERROR_INVALIDDATA;
         dts += sample_duration;
         offset += sample_size;
         sc->data_size += sample_size;