lzo: fix memcpy_backptr() with 0 offset

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

diff --git a/libavutil/lzo.c b/libavutil/lzo.c
index b3c69cf0c5332a0c42c036fb4b0251e6c7724082..0b9d2e42bab2fa27889d8d2f8a090d550c278cd9 100644 (file)
--- 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);