[FFmpeg-cvslog] avformat/mov: Disallow empty sidx
Michael Niedermayer
git at videolan.org
Wed Apr 6 21:33:51 EEST 2022
ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Wed Mar 2 13:01:53 2022 +0100| [338444c0161e044f1608b4f2780c619f1297512a] | committer: Michael Niedermayer
avformat/mov: Disallow empty sidx
It appears this is not allowed "Each Segment Index box documents how a (sub)segment is divided into one or more subsegments
(which may themselves be further subdivided using Segment Index boxes)."
Fixes: Null pointer dereference
Fixes: Ticket9517
Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 4419433d77278cb742944c4514be5f72a04103c0)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=338444c0161e044f1608b4f2780c619f1297512a
---
libavformat/mov.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 4bd4750a21..46d8e628fd 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -5124,6 +5124,8 @@ static int mov_read_sidx(MOVContext *c, AVIOContext *pb, MOVAtom atom)
avio_rb16(pb); // reserved
item_count = avio_rb16(pb);
+ if (item_count == 0)
+ return AVERROR_INVALIDDATA;
for (i = 0; i < item_count; i++) {
int index;
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