[FFmpeg-cvslog] lzo: fix memcpy_backptr() with 0 offset

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sat Dec 24 03:55:58 2011 +0100| [58c41799ab6b52df86b6afe23304f34b62741326] | committer: Michael Niedermayer

lzo: fix memcpy_backptr() with 0 offset

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=58c41799ab6b52df86b6afe23304f34b62741326
---

 libavutil/lzo.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libavutil/lzo.c b/libavutil/lzo.c
index b3c69cf..0b9d2e4 100644
--- a/libavutil/lzo.c
+++ b/libavutil/lzo.c
@@ -137,7 +137,7 @@ static inline void memcpy_backptr(uint8_t *dst, int back, int cnt) {
     const uint8_t *src = &dst[-back];
     if (back == 1) {
         memset(dst, *src, cnt);
-    } else {
+    } else if(back>0) {
 #ifdef OUTBUF_PADDED
         COPY2(dst, src);
         COPY2(dst + 2, src + 2);