[FFmpeg-cvslog] indeo4: check ref_mb

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Fri Mar 23 11:03:53 2012 +0100| [aae44fb4cdfab4fae4d981d2fe1fd708f1dcf9bb] | committer: Michael Niedermayer

indeo4: check ref_mb

Fix NULL deref

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=aae44fb4cdfab4fae4d981d2fe1fd708f1dcf9bb
---

 libavcodec/indeo4.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libavcodec/indeo4.c b/libavcodec/indeo4.c
index df80b11..1d280a0 100644
--- a/libavcodec/indeo4.c
+++ b/libavcodec/indeo4.c
@@ -517,7 +517,7 @@ static int decode_mb_info(IVI4DecContext *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 */