[FFmpeg-cvslog] avcodec/h264_ps: Forward errors from decode_scaling_list()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Mar  9 13:54:24 2017 +0100| [dc0b9b218c1970d79908523657fff65a16613ca2] | committer: Michael Niedermayer

avcodec/h264_ps: Forward errors from decode_scaling_list()

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=dc0b9b218c1970d79908523657fff65a16613ca2
---

 libavcodec/h264_ps.c | 44 ++++++++++++++++++++++++++------------------
 1 file changed, 26 insertions(+), 18 deletions(-)

diff --git a/libavcodec/h264_ps.c b/libavcodec/h264_ps.c
index f384ef2..c330efd 100644
--- a/libavcodec/h264_ps.c
+++ b/libavcodec/h264_ps.c
@@ -247,7 +247,7 @@ static inline int decode_vui_parameters(GetBitContext *gb, AVCodecContext *avctx
     return 0;
 }
 
-static void decode_scaling_list(GetBitContext *gb, uint8_t *factors, int size,
+static int decode_scaling_list(GetBitContext *gb, uint8_t *factors, int size,
                                 const uint8_t *jvt_list,
                                 const uint8_t *fallback_list)
 {
@@ -261,7 +261,7 @@ static void decode_scaling_list(GetBitContext *gb, uint8_t *factors, int size,
                 int v = get_se_golomb(gb);
                 if (v < -128 || v > 127) {
                     av_log(NULL, AV_LOG_ERROR, "delta scale %d is invalid\n", v);
-                    v = -last;
+                    return AVERROR_INVALIDDATA;
                 }
                 next = (last + v) & 0xff;
             }
@@ -271,6 +271,7 @@ static void decode_scaling_list(GetBitContext *gb, uint8_t *factors, int size,
             }
             last = factors[scan[i]] = next ? next : last;
         }
+    return 0;
 }
 
 /* returns non zero if the provided SPS scaling matrix has been filled */
@@ -288,23 +289,24 @@ static int decode_scaling_matrices(GetBitContext *gb, const SPS *sps,
     };
     int ret = 0;
     if (get_bits1(gb)) {
-        ret = is_sps;
-        decode_scaling_list(gb, scaling_matrix4[0], 16, default_scaling4[0], fallback[0]);        // Intra, Y
-        decode_scaling_list(gb, scaling_matrix4[1], 16, default_scaling4[0], scaling_matrix4[0]); // Intra, Cr
-        decode_scaling_list(gb, scaling_matrix4[2], 16, default_scaling4[0], scaling_matrix4[1]); // Intra, Cb
-        decode_scaling_list(gb, scaling_matrix4[3], 16, default_scaling4[1], fallback[1]);        // Inter, Y
-        decode_scaling_list(gb, scaling_matrix4[4], 16, default_scaling4[1], scaling_matrix4[3]); // Inter, Cr
-        decode_scaling_list(gb, scaling_matrix4[5], 16, default_scaling4[1], scaling_matrix4[4]); // Inter, Cb
+        ret |= decode_scaling_list(gb, scaling_matrix4[0], 16, default_scaling4[0], fallback[0]);        // Intra, Y
+        ret |= decode_scaling_list(gb, scaling_matrix4[1], 16, default_scaling4[0], scaling_matrix4[0]); // Intra, Cr
+        ret |= decode_scaling_list(gb, scaling_matrix4[2], 16, default_scaling4[0], scaling_matrix4[1]); // Intra, Cb
+        ret |= decode_scaling_list(gb, scaling_matrix4[3], 16, default_scaling4[1], fallback[1]);        // Inter, Y
+        ret |= decode_scaling_list(gb, scaling_matrix4[4], 16, default_scaling4[1], scaling_matrix4[3]); // Inter, Cr
+        ret |= decode_scaling_list(gb, scaling_matrix4[5], 16, default_scaling4[1], scaling_matrix4[4]); // Inter, Cb
         if (is_sps || pps->transform_8x8_mode) {
-            decode_scaling_list(gb, scaling_matrix8[0], 64, default_scaling8[0], fallback[2]); // Intra, Y
-            decode_scaling_list(gb, scaling_matrix8[3], 64, default_scaling8[1], fallback[3]); // Inter, Y
+            ret |= decode_scaling_list(gb, scaling_matrix8[0], 64, default_scaling8[0], fallback[2]); // Intra, Y
+            ret |= decode_scaling_list(gb, scaling_matrix8[3], 64, default_scaling8[1], fallback[3]); // Inter, Y
             if (sps->chroma_format_idc == 3) {
-                decode_scaling_list(gb, scaling_matrix8[1], 64, default_scaling8[0], scaling_matrix8[0]); // Intra, Cr
-                decode_scaling_list(gb, scaling_matrix8[4], 64, default_scaling8[1], scaling_matrix8[3]); // Inter, Cr
-                decode_scaling_list(gb, scaling_matrix8[2], 64, default_scaling8[0], scaling_matrix8[1]); // Intra, Cb
-                decode_scaling_list(gb, scaling_matrix8[5], 64, default_scaling8[1], scaling_matrix8[4]); // Inter, Cb
+                ret |= decode_scaling_list(gb, scaling_matrix8[1], 64, default_scaling8[0], scaling_matrix8[0]); // Intra, Cr
+                ret |= decode_scaling_list(gb, scaling_matrix8[4], 64, default_scaling8[1], scaling_matrix8[3]); // Inter, Cr
+                ret |= decode_scaling_list(gb, scaling_matrix8[2], 64, default_scaling8[0], scaling_matrix8[1]); // Intra, Cb
+                ret |= decode_scaling_list(gb, scaling_matrix8[5], 64, default_scaling8[1], scaling_matrix8[4]); // Inter, Cb
             }
         }
+        if (!ret)
+            ret = is_sps;
     }
 
     return ret;
@@ -335,6 +337,7 @@ int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
     unsigned int sps_id;
     int i, log2_max_frame_num_minus4;
     SPS *sps;
+    int ret;
 
     sps_buf = av_buffer_allocz(sizeof(*sps));
     if (!sps_buf)
@@ -413,8 +416,11 @@ int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
             goto fail;
         }
         sps->transform_bypass = get_bits1(gb);
-        sps->scaling_matrix_present |= decode_scaling_matrices(gb, sps, NULL, 1,
-                                sps->scaling_matrix4, sps->scaling_matrix8);
+        ret = decode_scaling_matrices(gb, sps, NULL, 1,
+                                      sps->scaling_matrix4, sps->scaling_matrix8);
+        if (ret < 0)
+            goto fail;
+        sps->scaling_matrix_present |= ret;
     } else {
         sps->chroma_format_idc = 1;
         sps->bit_depth_luma    = 8;
@@ -846,8 +852,10 @@ int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avct
     bits_left = bit_length - get_bits_count(gb);
     if (bits_left > 0 && more_rbsp_data_in_pps(sps, avctx)) {
         pps->transform_8x8_mode = get_bits1(gb);
-        decode_scaling_matrices(gb, sps, pps, 0,
+        ret = decode_scaling_matrices(gb, sps, pps, 0,
                                 pps->scaling_matrix4, pps->scaling_matrix8);
+        if (ret < 0)
+            goto fail;
         // second_chroma_qp_index_offset
         pps->chroma_qp_index_offset[1] = get_se_golomb(gb);
         if (pps->chroma_qp_index_offset[1] < -12 || pps->chroma_qp_index_offset[1] > 12) {