Fix segfault on dispose

In case of an empty nal_buffer the free method would run into a NULL pointer. Check for this.

1 files changed, 7 insertions, 5 deletions

diff --git a/src/video_dec/libvdpau/nal.c b/src/video_dec/libvdpau/nal.c
index 87a2b5450..cacc21ddf 100644
--- a/src/video_dec/libvdpau/nal.c
+++ b/src/video_dec/libvdpau/nal.c
@@ -42,11 +42,13 @@ void free_nal_buffer(struct nal_buffer *nal_buffer)
 {
   struct nal_unit *nal = nal_buffer->first;
 
-  do {
-    struct nal_unit *delete = nal;
-    nal = nal->next;
-    release_nal_unit(delete);
-  } while(nal != NULL);
+  if(nal != NULL) {
+    do {
+      struct nal_unit *delete = nal;
+      nal = nal->next;
+      release_nal_unit(delete);
+    } while(nal != NULL);
+  }
 
   free(nal_buffer);
 }