[FFmpeg-cvslog] dxa: Make sure the reference frame exists

[Luca Barbato]

ffmpeg | branch: release/0.10 | Luca Barbato <lu_zero at gentoo.org> | Wed Aug 14 16:51:53 2013 +0200| [86c169c5b691ac8434056936a7690fc4c64b4b1a] | committer: Sean McGovern

dxa: Make sure the reference frame exists

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable at libav.org
(cherry picked from commit 5ef7c84a9374681c64722a96d91741f3b990af2b)
Signed-off-by: Luca Barbato <lu_zero at gentoo.org>

Conflicts:
	libavcodec/dxa.c

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=86c169c5b691ac8434056936a7690fc4c64b4b1a
---

 libavcodec/dxa.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavcodec/dxa.c b/libavcodec/dxa.c
index 97b912a..632b1a4 100644
--- a/libavcodec/dxa.c
+++ b/libavcodec/dxa.c
@@ -255,6 +255,12 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPac
     case 5:
         c->pic.key_frame = !(compr & 1);
         c->pic.pict_type = (compr & 1) ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
+
+        if (!tmpptr && !c->pic.key_frame) {
+            av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
+            return AVERROR_INVALIDDATA;
+        }
+
         for(j = 0; j < avctx->height; j++){
             if(compr & 1){
                 for(i = 0; i < avctx->width; i++)