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| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-03-09 16:43:29 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-03-12 01:32:42 +0100 |
| commit | 2f37082827a405430c40408ee2db19ea2866ce64 (patch) | |
| tree | 1f55fcd9c747982863eed7eff5b9515dd91b065c | |
| parent | c266049191e5230e36e610874a57673e7af0515d (diff) | |
| download | ffmpeg-2f37082827a405430c40408ee2db19ea2866ce64.tar.gz | |
avformat/mov: Fix integer overflows related to sample_duration
Fixes: runtime error: signed integer overflow: -9166684017437101870 + -2495066639299164439 cannot be represented in type
Fixes: Chromium bug 791349
Reported-by: Matt Wolenetz <wolenetz@google.com>
Reviewed-by: Matt Wolenetz <wolenetz@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/mov.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/libavformat/mov.c b/libavformat/mov.c index 51228f5df2..b7f9c0cdd1 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -2885,14 +2885,19 @@ static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom) && total_sample_count > 100 && sample_duration/10 > duration / total_sample_count) sample_duration = duration / total_sample_count; - duration+=(int64_t)sample_duration*sample_count; + duration+=(int64_t)sample_duration*(uint64_t)sample_count; total_sample_count+=sample_count; } sc->stts_count = i; - sc->duration_for_fps += duration; - sc->nb_frames_for_fps += total_sample_count; + if (duration > 0 && + duration <= INT64_MAX - sc->duration_for_fps && + total_sample_count <= INT64_MAX - sc->nb_frames_for_fps + ) { + sc->duration_for_fps += duration; + sc->nb_frames_for_fps += total_sample_count; + } if (pb->eof_reached) { av_log(c->fc, AV_LOG_WARNING, "reached eof, corrupted STTS atom\n"); @@ -4798,8 +4803,13 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom) dts += sample_duration; offset += sample_size; sc->data_size += sample_size; - sc->duration_for_fps += sample_duration; - sc->nb_frames_for_fps ++; + + if (sample_duration <= INT64_MAX - sc->duration_for_fps && + 1 <= INT64_MAX - sc->nb_frames_for_fps + ) { + sc->duration_for_fps += sample_duration; + sc->nb_frames_for_fps ++; + } } if (i < entries) { // EOF found before reading all entries. Fix the hole this would |