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av_memcpy_backptr: avoid an infinite loop for back = 0

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CC:libav-stable@libav.org
(cherry picked from commit f935aca44c)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Anton Khirnov
2013-02-13 21:36:25 +01:00
committed by Reinhard Tartler
parent 612b28194b
commit 48fd461977
1 changed files with 3 additions and 0 deletions
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3
libavutil/mem.c
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@@ -252,6 +252,9 @@ static void fill32(uint8_t *dst, int len)
void av_memcpy_backptr(uint8_t *dst, int back, int cnt) void av_memcpy_backptr(uint8_t *dst, int back, int cnt)
{ {
const uint8_t *src = &dst[-back]; const uint8_t *src = &dst[-back];
if (!back)
return;
if (back == 1) { if (back == 1) {
memset(dst, *src, cnt); memset(dst, *src, cnt);
} else if (back == 2) { } else if (back == 2) {