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bink: Prevent NULL dereferences with missing reference frame

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Signed-off-by: Janne Grunau <janne-libav@jannau.net>
This commit is contained in:
Laurent Aimar 2011-09-27 22:15:31 +00:00 committed by Janne Grunau
parent 2c6cf13940
commit c7e631986b
1 changed files with 5 additions and 3 deletions
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8
libavcodec/bink.c
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@ -950,8 +950,9 @@ static int bink_decode_plane(BinkContext *c, GetBitContext *gb, int plane_idx,
for (i = 0; i < BINK_NB_SRC; i++) for (i = 0; i < BINK_NB_SRC; i++)
read_bundle(gb, c, i); read_bundle(gb, c, i);
ref_start = c->last.data[plane_idx]; ref_start = c->last.data[plane_idx] ? c->last.data[plane_idx]
ref_end = c->last.data[plane_idx] : c->pic.data[plane_idx];
ref_end = ref_start
+ (bw - 1 + c->last.linesize[plane_idx] * (bh - 1)) * 8; + (bw - 1 + c->last.linesize[plane_idx] * (bh - 1)) * 8;
for (i = 0; i < 64; i++) for (i = 0; i < 64; i++)
@ -980,7 +981,8 @@ static int bink_decode_plane(BinkContext *c, GetBitContext *gb, int plane_idx,
if (by == bh) if (by == bh)
break; break;
dst = c->pic.data[plane_idx] + 8*by*stride; dst = c->pic.data[plane_idx] + 8*by*stride;
prev = c->last.data[plane_idx] + 8*by*stride; prev = (c->last.data[plane_idx] ? c->last.data[plane_idx]
: c->pic.data[plane_idx]) + 8*by*stride;
for (bx = 0; bx < bw; bx++, dst += 8, prev += 8) { for (bx = 0; bx < bw; bx++, dst += 8, prev += 8) {
blk = get_value(c, BINK_SRC_BLOCK_TYPES); blk = get_value(c, BINK_SRC_BLOCK_TYPES);
// 16x16 block type on odd line means part of the already decoded block, so skip it // 16x16 block type on odd line means part of the already decoded block, so skip it