avcodec/vc1dec: do not crash when flushing without an allocated frame

Fixes Ticket3837 Found-by: Piotr Bandurski <[email protected]> Signed-off-by: Michael Niedermayer <[email protected]> (cherry picked from commit 6801eb0) Signed-off-by: Michael Niedermayer <[email protected]>
passoir · Aug 11, 2014 · a1fe3b4 · a1fe3b4
1 parent c5129da
commit a1fe3b4
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
@@ -5514,7 +5514,7 @@ static void vc1_sprite_flush(AVCodecContext *avctx)
        Since we can't enforce it, clear to black the missing sprite. This is
        wrong but it looks better than doing nothing. */
 
-    if (f->data[0])
+    if (f && f->data[0])
         for (plane = 0; plane < (s->flags&CODEC_FLAG_GRAY ? 1 : 3); plane++)
             for (i = 0; i < v->sprite_height>>!!plane; i++)
                 memset(f->data[plane] + i * f->linesize[plane],