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

Fixes Ticket3837
Found-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-08-11 02:16:43 +02:00
parent f4e814f787
commit 6801eb0a09
1 changed files with 1 additions and 1 deletions
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2
libavcodec/vc1dec.c
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@ -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],