[FFmpeg-cvslog] Fix read-after-free in matroska_read_seek().
Xiaohan Wang
git at videolan.org
Sat Nov 8 01:41:48 CET 2014
ffmpeg | branch: master | Xiaohan Wang <xhwang at chromium.org> | Thu Nov 6 12:59:54 2014 -0800| [33301f001747d7a542073c634cc81da5eff051cf] | committer: Michael Niedermayer
Fix read-after-free in matroska_read_seek().
In matroska_read_seek(), |tracks| is assigned at the begining of the function.
However, functions like matroska_parse_cues() could reallocate the tracks so
that |tracks| can get invalidated.
This CL assigns |tracks| only before we use it so that it won't be invalidated.
BUG=427266
TEST=Test case in associated bug passes now.
Change-Id: I9c7065fe8f4311ca846076281df2282d190ed344
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=33301f001747d7a542073c634cc81da5eff051cf
---
libavformat/matroskadec.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index f29a290..3b45c3b 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -2913,7 +2913,7 @@ static int matroska_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
MatroskaDemuxContext *matroska = s->priv_data;
- MatroskaTrack *tracks = matroska->tracks.elem;
+ MatroskaTrack *tracks = NULL;
AVStream *st = s->streams[stream_index];
int i, index, index_sub, index_min;
@@ -2943,6 +2943,7 @@ static int matroska_read_seek(AVFormatContext *s, int stream_index,
goto err;
index_min = index;
+ tracks = matroska->tracks.elem;
for (i = 0; i < matroska->tracks.nb_elem; i++) {
tracks[i].audio.pkt_cnt = 0;
tracks[i].audio.sub_packet_cnt = 0;
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