[FFmpeg-cvslog] mpc8: Check the seek table size parsed from the bitstream

[Martin Storsjö]

ffmpeg | branch: release/0.10 | Martin Storsjö <martin at martin.st> | Wed Sep 11 22:47:06 2013 +0300| [486c45767587151b517bb6fde602d43d178da203] | committer: Luca Barbato

mpc8: Check the seek table size parsed from the bitstream

Limit the size to INT_MAX/2 (for simplicity) to be sure that
size + FF_INPUT_BUFFER_PADDING_SIZE won't overflow.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable at libav.org
Signed-off-by: Martin Storsjö <martin at martin.st>
(cherry picked from commit 459f2b393a3f89ed08d10fbceb4738d1429f268e)
Signed-off-by: Luca Barbato <lu_zero at gentoo.org>
(cherry picked from commit f8a72f041c049e812dfa1f32156327e9778f5710)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=486c45767587151b517bb6fde602d43d178da203
---

 libavformat/mpc8.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/mpc8.c b/libavformat/mpc8.c
index d956049..97a9b01 100644
--- a/libavformat/mpc8.c
+++ b/libavformat/mpc8.c
@@ -143,6 +143,10 @@ static void mpc8_parse_seektable(AVFormatContext *s, int64_t off)
         av_log(s, AV_LOG_ERROR, "No seek table at given position\n");
         return;
     }
+    if (size < 0 || size >= INT_MAX / 2) {
+        av_log(s, AV_LOG_ERROR, "Bad seek table size\n");
+        return;
+    }
     if(!(buf = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE)))
         return;
     avio_read(s->pb, buf, size);