[FFmpeg-cvslog] yop: check for missing extradata

[Michael Niedermayer]

ffmpeg | branch: release/0.7 | Michael Niedermayer <michaelni at gmx.at> | Mon May 28 17:08:06 2012 +0200| [0f5840b51abe873da8e7805bc0aeb6ea9725b78a] | committer: Michael Niedermayer

yop: check for missing extradata

Fixes null ptr deref
Fixes Ticket1361

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 77a4c8b959fa9bc6bcaa42b40a0b046cdf3fec38)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0f5840b51abe873da8e7805bc0aeb6ea9725b78a
---

 libavcodec/yop.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/yop.c b/libavcodec/yop.c
index 45a3344..40d9f7a 100644
--- a/libavcodec/yop.c
+++ b/libavcodec/yop.c
@@ -90,6 +90,11 @@ static av_cold int yop_decode_init(AVCodecContext *avctx)
         return -1;
     }
 
+    if (!avctx->extradata) {
+        av_log(avctx, AV_LOG_ERROR, "extradata missing\n");
+        return AVERROR_INVALIDDATA;
+    }
+
     avctx->pix_fmt = PIX_FMT_PAL8;
 
     avcodec_get_frame_defaults(&s->frame);