[FFmpeg-cvslog] avcodec/cinepak: fix integer underflow

[Michael Niedermayer]

ffmpeg | branch: release/2.0 | Michael Niedermayer <michaelni at gmx.at> | Fri Oct  3 19:33:01 2014 +0200| [97fdbd12f9093366a9a7f870b3ba17771f1e3419] | committer: Michael Niedermayer

avcodec/cinepak: fix integer underflow

Fixes out of array access
Fixes: asan_heap-oob_4da0ba_6_asan_heap-oob_4da0ba_241_cvid_crash.avi

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit e7e5114c506957f40aafd794e06de1a7e341e9d5)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=97fdbd12f9093366a9a7f870b3ba17771f1e3419
---

 libavcodec/cinepak.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/cinepak.c b/libavcodec/cinepak.c
index f5bc113..4a6e143 100644
--- a/libavcodec/cinepak.c
+++ b/libavcodec/cinepak.c
@@ -135,7 +135,7 @@ static int cinepak_decode_vectors (CinepakContext *s, cvid_strip *strip,
     const uint8_t   *eod = (data + size);
     uint32_t         flag, mask;
     uint8_t         *cb0, *cb1, *cb2, *cb3;
-    unsigned int     x, y;
+    int             x, y;
     char            *ip0, *ip1, *ip2, *ip3;
 
     flag = 0;