[FFmpeg-devel] [PATCH] indeo5: Fix null pointer dereferences of ref_mb
Michael Niedermayer
michaelni at gmx.at
Thu Dec 29 02:37:24 CET 2011
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
---
libavcodec/indeo5.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/libavcodec/indeo5.c b/libavcodec/indeo5.c
index cd6e689..fc534dd 100644
--- a/libavcodec/indeo5.c
+++ b/libavcodec/indeo5.c
@@ -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);
--
1.7.5.4
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