h264: reject mismatching luma/chroma bit depths during sps parsing
authorAnton Khirnov <anton@khirnov.net>
Thu, 28 Nov 2013 09:54:35 +0000 (10:54 +0100)
committerSean McGovern <gseanmcg@gmail.com>
Mon, 14 Apr 2014 20:55:38 +0000 (16:55 -0400)
There is no point in delaying the check and it avoids bugs with a
half-initialized context.

Fixes invalid reads.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:libav-stable@libav.org

libavcodec/h264.c
libavcodec/h264_ps.c

index b5f4493..38764d1 100644 (file)
@@ -2427,12 +2427,6 @@ static int h264_set_parameter_from_sps(H264Context *h)
     if (s->avctx->has_b_frames < 2)
         s->avctx->has_b_frames = !s->low_delay;
 
-    if (h->sps.bit_depth_luma != h->sps.bit_depth_chroma) {
-        av_log_missing_feature(s->avctx,
-            "Different bit depth between chroma and luma", 1);
-        return AVERROR_PATCHWELCOME;
-    }
-
     if (s->avctx->bits_per_raw_sample != h->sps.bit_depth_luma ||
         h->cur_chroma_format_idc      != h->sps.chroma_format_idc) {
         if (s->avctx->codec &&
index fad2d77..a1dfbda 100644 (file)
@@ -349,6 +349,11 @@ int ff_h264_decode_seq_parameter_set(H264Context *h){
         }
         sps->bit_depth_luma   = get_ue_golomb(&s->gb) + 8;
         sps->bit_depth_chroma = get_ue_golomb(&s->gb) + 8;
+        if (sps->bit_depth_chroma != sps->bit_depth_luma) {
+            av_log_missing_feature(s->avctx,
+                "Different bit depth between chroma and luma", 1);
+            goto fail;
+        }
         sps->transform_bypass = get_bits1(&s->gb);
         decode_scaling_matrices(h, sps, NULL, 1, sps->scaling_matrix4, sps->scaling_matrix8);
     }else{