[FFmpeg-cvslog] avformat/mov: Break out early if chunk_count is 0 in mov_build_index()
Michael Niedermayer
git at videolan.org
Sat Jun 16 01:31:55 EEST 2018
ffmpeg | branch: release/4.0 | Michael Niedermayer <michael at niedermayer.cc> | Tue May 15 17:06:59 2018 +0200| [1d01a3b34c924998da310c4776af36047d1b7fde] | committer: Michael Niedermayer
avformat/mov: Break out early if chunk_count is 0 in mov_build_index()
Without this some operations might overflow (undefined behavior)
even though the index adding loop would never execute
No testcase known
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 56e76bd0579cc7f7b28860885d9e569a39daf41b)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1d01a3b34c924998da310c4776af36047d1b7fde
---
libavformat/mov.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 0667ba3ded..da0b1942b9 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -3899,6 +3899,9 @@ static void mov_build_index(MOVContext *mov, AVStream *st)
} else {
unsigned chunk_samples, total = 0;
+ if (!sc->chunk_count)
+ return;
+
// compute total chunk count
for (i = 0; i < sc->stsc_count; i++) {
unsigned count, chunk_count;
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