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indeo4: fix null ptr dereference

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Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-03-31 23:31:56 +02:00
parent 6bd9744582
commit 5216245a2c
1 changed files with 2 additions and 2 deletions
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4
libavcodec/indeo4.c
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@ -519,7 +519,7 @@ static int decode_mb_info(IVI4DecContext *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);
@ -553,7 +553,7 @@ static int decode_mb_info(IVI4DecContext *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);