[FFmpeg-cvslog] avformat/smacker: fix integer overflow with pts_inc

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Sat Dec  5 13:06:16 2015 +0100| [0e3ec7db5334e580b2d85153d025042c8236901e] | committer: Michael Niedermayer

avformat/smacker: fix integer overflow with pts_inc

Fixes: ce19e41f0ef1e52a23edc488faecdb58/asan_heap-oob_2504e97_4202_ffa0df1baed14022b9bfd4f8ac23d0cb.smk

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 7ed47e97297fd5ef473d0cc93f0455adbadaac83)

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0e3ec7db5334e580b2d85153d025042c8236901e
---

 libavformat/smacker.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/smacker.c b/libavformat/smacker.c
index 5dcf4ad..de8bbdb 100644
--- a/libavformat/smacker.c
+++ b/libavformat/smacker.c
@@ -120,6 +120,11 @@ static int smacker_read_header(AVFormatContext *s)
     smk->height = avio_rl32(pb);
     smk->frames = avio_rl32(pb);
     smk->pts_inc = (int32_t)avio_rl32(pb);
+    if (smk->pts_inc > INT_MAX / 100) {
+        av_log(s, AV_LOG_ERROR, "pts_inc %d is too large\n", smk->pts_inc);
+        return AVERROR_INVALIDDATA;
+    }
+
     smk->flags = avio_rl32(pb);
     if(smk->flags & SMACKER_FLAG_RING_FRAME)
         smk->frames++;