jvdec: check videosize

Fixes null ptr dereference
fixes Ticket1364

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit b4904e804d3b1c56ac4f5d3386b15daae98fca2d)

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

1 files changed, 4 insertions, 0 deletions

diff --git a/libavcodec/jvdec.c b/libavcodec/jvdec.c
index d371950b6e..4031fadf15 100644
--- a/libavcodec/jvdec.c
+++ b/libavcodec/jvdec.c
@@ -143,6 +143,10 @@ static int decode_frame(AVCodecContext *avctx,
     buf += 5;
 
     if (video_size) {
+        if(video_size < 0) {
+            av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size);
+            return AVERROR_INVALIDDATA;
+        }
         if (avctx->reget_buffer(avctx, &s->frame) < 0) {
             av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
             return -1;