[FFmpeg-cvslog] mpc8: check seektable size before attempting to use it.

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sun Dec  2 04:21:42 2012 +0100| [b61ba262a1e275f8129b7383d70fe48051b47fcf] | committer: Michael Niedermayer

mpc8: check seektable size before attempting to use it.

Fixes null pointer dereference

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b61ba262a1e275f8129b7383d70fe48051b47fcf
---

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

diff --git a/libavformat/mpc8.c b/libavformat/mpc8.c
index 56ed7ad..191f696 100644
--- a/libavformat/mpc8.c
+++ b/libavformat/mpc8.c
@@ -145,6 +145,10 @@ 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 > INT_MAX/10 || size<=0) {
+        av_log(s, AV_LOG_ERROR, "Seek table size is invalid\n");
+        return;
+    }
     if(!(buf = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE)))
         return;
     avio_read(s->pb, buf, size);