diff --git a/libavcodec/dxva2.c b/libavcodec/dxva2.c
index f31c5e262b..c2f7ac9060 100644
--- a/libavcodec/dxva2.c
+++ b/libavcodec/dxva2.c
@@ -56,7 +56,7 @@ int ff_dxva2_commit_buffer(AVCodecContext *avctx,
                            unsigned type, const void *data, unsigned size,
                            unsigned mb_count)
 {
-    void     *dxva_data;
+    void     *dxva_data = NULL;
     unsigned dxva_size;
     int      result;
     HRESULT hr = 0;
@@ -78,7 +78,7 @@ int ff_dxva2_commit_buffer(AVCodecContext *avctx,
                type, hr);
         return -1;
     }
-    if (size <= dxva_size) {
+    if (dxva_data && size <= dxva_size) {
         memcpy(dxva_data, data, size);
 
 #if CONFIG_D3D11VA