swscale: fix NULL checking in sws_alloc_context()

sws_getCachedContext() and sws_getContext() expect sws_alloc_context()
to return NULL when out of memory, as follows.

    if (!(context = sws_alloc_context()))
        return NULL;

This patch fixes sws_alloc_context() to return NULL in that case.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/libswscale/utils.c b/libswscale/utils.c
index e5e4d60dd2..f0a2b464fc 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -844,8 +844,10 @@ SwsContext *sws_alloc_context(void)
 {
     SwsContext *c = av_mallocz(sizeof(SwsContext));
 
-    c->av_class = &sws_context_class;
-    av_opt_set_defaults(c);
+    if (c) {
+        c->av_class = &sws_context_class;
+        av_opt_set_defaults(c);
+    }
 
     return c;
 }