From bf2cba453244a74331238a472fe0e309f116f4d9 Mon Sep 17 00:00:00 2001
From: "Ronald S. Bultje" <rsbultje@gmail.com>
Date: Fri, 8 Jul 2011 12:28:28 -0700
Subject: swscale: fix crash in 8-bpc bilinear output without alpha.

We accessed the alpha array even it wasn't used and didn't
exist, hence leading to a NULL pointer segfault.
---
 libswscale/swscale.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'libswscale')

diff --git a/libswscale/swscale.c b/libswscale/swscale.c
index a302373b85..527dd80e0c 100644
--- a/libswscale/swscale.c
+++ b/libswscale/swscale.c
@@ -1136,7 +1136,8 @@ yuv2rgb_2_c_template(SwsContext *c, const int16_t *buf[2],
     const int16_t *buf0  = buf[0],  *buf1  = buf[1],
                   *ubuf0 = ubuf[0], *ubuf1 = ubuf[1],
                   *vbuf0 = vbuf[0], *vbuf1 = vbuf[1],
-                  *abuf0 = abuf[0], *abuf1 = abuf[1];
+                  *abuf0 = hasAlpha ? abuf[0] : NULL,
+                  *abuf1 = hasAlpha ? abuf[1] : NULL;
     int  yalpha1 = 4095 - yalpha;
     int uvalpha1 = 4095 - uvalpha;
     int i;
-- 
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