[FFmpeg-cvslog] swscale/utils: Clear pix buffers

[Michael Niedermayer]

ffmpeg | branch: release/2.4 | Michael Niedermayer <michael at niedermayer.cc> | Wed Jul 15 19:20:19 2015 +0200| [3bc20fe48c5e374d92948e39a09d28332c339e0e] | committer: Michael Niedermayer

swscale/utils: Clear pix buffers

Fixes use of uninitialized memory
Fixes: a96874b9466b6edc660a519c7ad47977_signal_sigsegv_7ffff713351a_744_nc_sample.avi with memlimit 2147483648

Found-by: Samuel Groß, Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit a5d44d5c220e12ca0cb7a4eceb0f74759cb13111)

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=3bc20fe48c5e374d92948e39a09d28332c339e0e
---

 libswscale/utils.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libswscale/utils.c b/libswscale/utils.c
index 98a9e4d..84c58ca 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -1421,9 +1421,9 @@ av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
 
     /* Allocate pixbufs (we use dynamic allocation because otherwise we would
      * need to allocate several megabytes to handle all possible cases) */
-    FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);
-    FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);
-    FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);
+    FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);
+    FF_ALLOCZ_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);
+    FF_ALLOCZ_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);
     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))
         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);
     /* Note we need at least one pixel more at the end because of the MMX code