xan: Prevent out of bound accesses

[ffmpeg] / libavcodec / h264_ps.c

diff --git a/libavcodec/h264_ps.c b/libavcodec/h264_ps.c
index 5ca2361a6d696a3f41b9c356e52d70bb19f6f0c9..7491807460a3759a268b2537139d9d1f7ad0068f 100644 (file)
--- a/libavcodec/h264_ps.c
+++ b/libavcodec/h264_ps.c
@@ -396,6 +396,7 @@ int ff_h264_decode_seq_parameter_set(H264Context *h){
 #endif
     sps->crop= get_bits1(&s->gb);
     if(sps->crop){
+        int crop_limit = sps->chroma_format_idc == 3 ? 16 : 8;
         sps->crop_left  = get_ue_golomb(&s->gb);
         sps->crop_right = get_ue_golomb(&s->gb);
         sps->crop_top   = get_ue_golomb(&s->gb);
@@ -403,7 +404,7 @@ int ff_h264_decode_seq_parameter_set(H264Context *h){
         if(sps->crop_left || sps->crop_top){
             av_log(h->s.avctx, AV_LOG_ERROR, "insane cropping not completely supported, this could look slightly wrong ...\n");
         }
-        if(sps->crop_right >= (8<<CHROMA444) || sps->crop_bottom >= (8<<CHROMA444)){
+        if(sps->crop_right >= crop_limit || sps->crop_bottom >= crop_limit){
             av_log(h->s.avctx, AV_LOG_ERROR, "brainfart cropping not supported, this could look slightly wrong ...\n");
         }
     }else{