diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c
index 8e91613068..3e1f67172a 100644
--- a/libavcodec/vp8.c
+++ b/libavcodec/vp8.c
@@ -247,7 +247,11 @@ int update_dimensions(VP8Context *s, int width, int height, int is_vp7)
             return AVERROR(ENOMEM);
         }
 #if HAVE_THREADS
-        pthread_mutex_init(&s->thread_data[i].lock, NULL);
+        ret = pthread_mutex_init(&s->thread_data[i].lock, NULL);
+        if (ret) {
+            free_buffers(s);
+            return AVERROR(ret);
+        }
         pthread_cond_init(&s->thread_data[i].cond, NULL);
 #endif
     }