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indeo5: Fix null pointer dereferences of ref_mb 

Reviewed-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-12-29 02:34:43 +01:00
parent 7ae251b4d8
commit f41a6c8f3a
1 changed files with 3 additions and 3 deletions
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6
libavcodec/indeo5.c
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@ -482,7 +482,7 @@ static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,
}
mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
if (band->inherit_mv){
if (band->inherit_mv && ref_mb){
/* motion vector inheritance */
if (mv_scale) {
mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
@ -493,7 +493,7 @@ static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,
}
}
} else {
if (band->inherit_mv) {
if (band->inherit_mv && ref_mb) {
mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
} else if (ctx->frame_type == FRAMETYPE_INTRA) {
mb->type = 0; /* mb_type is always INTRA for intra-frames */
@ -519,7 +519,7 @@ static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,
if (!mb->type) {
mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
} else {
if (band->inherit_mv){
if (band->inherit_mv && ref_mb){
/* motion vector inheritance */
if (mv_scale) {
mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);