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vc1dec: Fix null pointer dereference in vc1_decode_skip_blocks()

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This handles the last frame being unavailable like all the other
code in vc1dec.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-12-05 05:47:37 +01:00
parent 217b10de3f
commit 09de0ffeab
1 changed files with 5 additions and 3 deletions
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8
libavcodec/vc1dec.c
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@ -4745,9 +4745,11 @@ static void vc1_decode_skip_blocks(VC1Context *v)
s->mb_x = 0;
ff_init_block_index(s);
ff_update_block_index(s);
memcpy(s->dest[0], s->last_picture.f.data[0] + s->mb_y * 16 * s->linesize, s->linesize * 16);
memcpy(s->dest[1], s->last_picture.f.data[1] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);
memcpy(s->dest[2], s->last_picture.f.data[2] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);
if (s->last_picture.f.data[0]) {
memcpy(s->dest[0], s->last_picture.f.data[0] + s->mb_y * 16 * s->linesize, s->linesize * 16);
memcpy(s->dest[1], s->last_picture.f.data[1] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);
memcpy(s->dest[2], s->last_picture.f.data[2] + s->mb_y * 8 * s->uvlinesize, s->uvlinesize * 8);
}
ff_draw_horiz_band(s, s->mb_y * 16, 16);
s->first_slice_line = 0;
}