Fixes: null pointer dereference
Fixes: alloc_slice.mp4

Found-by: Rafael Dutra <rafael.du...@cispa.de>
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libswscale/slice.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libswscale/slice.c b/libswscale/slice.c
index d96db13364..68517da00b 100644
--- a/libswscale/slice.c
+++ b/libswscale/slice.c
@@ -288,7 +288,8 @@ int ff_init_filters(SwsContext * c)
     if (!c->desc)
         return AVERROR(ENOMEM);
     c->slice = av_mallocz_array(sizeof(SwsSlice), c->numSlice);
-
+    if (!c->slice)
+        goto cleanup;
 
     res = alloc_slice(&c->slice[0], c->srcFormat, c->srcH, c->chrSrcH, 
c->chrSrcHSubSample, c->chrSrcVSubSample, 0);
     if (res < 0) goto cleanup;
-- 
2.17.1

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