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indeo3: Fix null ptr dereference

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Fixes Ticket804
Bug found by: Oana Stratulat

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 134aaa79f7f1ce1df64afc7d10d2b3de77df7b08)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-12-21 00:35:10 +01:00
parent acbdee0a2b
commit d20e948f07
1 changed files with 2 additions and 1 deletions
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3
libavcodec/indeo3.c
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@ -770,7 +770,8 @@ static int parse_bintree(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
/* get motion vector index and setup the pointer to the mv set */
if (!ctx->need_resync)
ctx->next_cell_data = &ctx->gb.buffer[(get_bits_count(&ctx->gb) + 7) >> 3];
curr_cell.mv_ptr = &ctx->mc_vectors[*(ctx->next_cell_data++) << 1];
if(ctx->mc_vectors)
curr_cell.mv_ptr = &ctx->mc_vectors[*(ctx->next_cell_data++) << 1];
curr_cell.tree = 1; /* enter the VQ tree */
UPDATE_BITPOS(8);
} else { /* VQ tree DATA code */