mjpeg: fix crash with lowres and flipped images

Fixes Ticket1155

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

1 files changed, 4 insertions, 0 deletions

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index b0f6fdf0fd..c3e69f69e1 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -974,6 +974,10 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
                "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
         s->flipped = 0;
     }
+    if (s->flipped && s->avctx->lowres) {
+        av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with lowres\n");
+        s->flipped = 0;
+    }
 
     for (i = 0; i < nb_components; i++) {
         int c   = s->comp_index[i];