avio: Check for memory allocation failure of private data

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

libavformat/avio.c

@@ -143,6 +143,10 @@ static int url_alloc_for_protocol (URLContext **puc, struct URLProtocol *up,
     uc->max_packet_size = 0; /* default: stream file */
     if (up->priv_data_size) {
         uc->priv_data = av_mallocz(up->priv_data_size);
+        if (!uc->priv_data) {
+            err = AVERROR(ENOMEM);
+            goto fail;
+        }
         if (up->priv_data_class) {
             int proto_len= strlen(up->name);
             char *start = strchr(uc->filename, ',');
@@ -180,6 +184,9 @@ static int url_alloc_for_protocol (URLContext **puc, struct URLProtocol *up,
     return 0;
  fail:
     *puc = NULL;
+    if (uc)
+        av_freep(&uc->priv_data);
+    av_freep(&uc);
 #if CONFIG_NETWORK
     if (up->flags & URL_PROTOCOL_FLAG_NETWORK)
         ff_network_close();