av_memcpy_backptr: avoid an infinite loop for back = 0

CC:libav-stable@libav.org

av_memcpy_backptr: avoid an infinite loop for back = 0
CC:libav-stable@libav.org
f935aca4 · Anton Khirnov · 8097fc9a · f935aca4
Commit f935aca4 authored Feb 13, 2013 by Anton Khirnov
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mem.c libavutil/mem.c +3 -0

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--- a/libavutil/mem.c
+++ b/libavutil/mem.c
@@ -252,6 +252,9 @@ static void fill32(uint8_t *dst, int len)
 void av_memcpy_backptr(uint8_t *dst, int back, int cnt)
 {
    const uint8_t *src = &dst[-back];
+    if (!back)
+        return;
+
    if (back == 1) {
        memset(dst, *src, cnt);
    } else if (back == 2) {