From e25cc9920accb43dd4af152358b78160e85d64a2 Mon Sep 17 00:00:00 2001
From: Matthieu Bouron <matthieu.bouron@stupeflix.com>
Date: Wed, 7 Sep 2016 11:36:10 +0200
Subject: [PATCH 1/2] lavc/hevc: store VPS/SPS/PPS data

---
 libavcodec/hevc.h    |  9 +++++++++
 libavcodec/hevc_ps.c | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/libavcodec/hevc.h b/libavcodec/hevc.h
index be91010..6a3c750 100644
--- a/libavcodec/hevc.h
+++ b/libavcodec/hevc.h
@@ -387,6 +387,9 @@ typedef struct HEVCVPS {
     uint8_t vps_poc_proportional_to_timing_flag;
     int vps_num_ticks_poc_diff_one; ///< vps_num_ticks_poc_diff_one_minus1 + 1
     int vps_num_hrd_parameters;
+
+    uint8_t data[4096];
+    int data_size;
 } HEVCVPS;
 
 typedef struct ScalingList {
@@ -483,6 +486,9 @@ typedef struct HEVCSPS {
     int vshift[3];
 
     int qp_bd_offset;
+
+    uint8_t data[4096];
+    int data_size;
 } HEVCSPS;
 
 typedef struct HEVCPPS {
@@ -557,6 +563,9 @@ typedef struct HEVCPPS {
     int *tile_pos_rs;       ///< TilePosRS
     int *min_tb_addr_zs;    ///< MinTbAddrZS
     int *min_tb_addr_zs_tab;///< MinTbAddrZS
+
+    uint8_t data[4096];
+    int data_size;
 } HEVCPPS;
 
 typedef struct HEVCParamSets {
diff --git a/libavcodec/hevc_ps.c b/libavcodec/hevc_ps.c
index 83f2ec2..d08ba34 100644
--- a/libavcodec/hevc_ps.c
+++ b/libavcodec/hevc_ps.c
@@ -399,6 +399,7 @@ int ff_hevc_decode_nal_vps(GetBitContext *gb, AVCodecContext *avctx,
 {
     int i,j;
     int vps_id = 0;
+    ptrdiff_t nal_size;
     HEVCVPS *vps;
     AVBufferRef *vps_buf = av_buffer_allocz(sizeof(*vps));
 
@@ -408,6 +409,17 @@ int ff_hevc_decode_nal_vps(GetBitContext *gb, AVCodecContext *avctx,
 
     av_log(avctx, AV_LOG_DEBUG, "Decoding VPS\n");
 
+    nal_size = gb->buffer_end - gb->buffer;
+    if (nal_size > sizeof(vps->data)) {
+        av_log(avctx, AV_LOG_WARNING, "Truncating likely oversized VPS "
+               "(%"PTRDIFF_SPECIFIER" > %"SIZE_SPECIFIER")\n",
+               nal_size, sizeof(vps->data));
+        vps->data_size = sizeof(vps->data);
+    } else {
+        vps->data_size = nal_size;
+    }
+    memcpy(vps->data, gb->buffer, vps->data_size);
+
     vps_id = get_bits(gb, 4);
     if (vps_id >= MAX_VPS_COUNT) {
         av_log(avctx, AV_LOG_ERROR, "VPS id out of range: %d\n", vps_id);
@@ -1177,6 +1189,7 @@ int ff_hevc_decode_nal_sps(GetBitContext *gb, AVCodecContext *avctx,
     AVBufferRef *sps_buf = av_buffer_allocz(sizeof(*sps));
     unsigned int sps_id;
     int ret;
+    ptrdiff_t nal_size;
 
     if (!sps_buf)
         return AVERROR(ENOMEM);
@@ -1184,6 +1197,17 @@ int ff_hevc_decode_nal_sps(GetBitContext *gb, AVCodecContext *avctx,
 
     av_log(avctx, AV_LOG_DEBUG, "Decoding SPS\n");
 
+    nal_size = gb->buffer_end - gb->buffer;
+    if (nal_size > sizeof(sps->data)) {
+        av_log(avctx, AV_LOG_WARNING, "Truncating likely oversized SPS "
+               "(%"PTRDIFF_SPECIFIER" > %"SIZE_SPECIFIER")\n",
+               nal_size, sizeof(sps->data));
+        sps->data_size = sizeof(sps->data);
+    } else {
+        sps->data_size = nal_size;
+    }
+    memcpy(sps->data, gb->buffer, sps->data_size);
+
     ret = ff_hevc_parse_sps(sps, gb, &sps_id,
                             apply_defdispwin,
                             ps->vps_list, avctx);
@@ -1407,6 +1431,7 @@ int ff_hevc_decode_nal_pps(GetBitContext *gb, AVCodecContext *avctx,
     HEVCSPS      *sps = NULL;
     int i, ret = 0;
     unsigned int pps_id = 0;
+    ptrdiff_t nal_size;
 
     AVBufferRef *pps_buf;
     HEVCPPS *pps = av_mallocz(sizeof(*pps));
@@ -1423,6 +1448,17 @@ int ff_hevc_decode_nal_pps(GetBitContext *gb, AVCodecContext *avctx,
 
     av_log(avctx, AV_LOG_DEBUG, "Decoding PPS\n");
 
+    nal_size = gb->buffer_end - gb->buffer;
+    if (nal_size > sizeof(pps->data)) {
+        av_log(avctx, AV_LOG_WARNING, "Truncating likely oversized PPS "
+               "(%"PTRDIFF_SPECIFIER" > %"SIZE_SPECIFIER")\n",
+               nal_size, sizeof(pps->data));
+        pps->data_size = sizeof(pps->data);
+    } else {
+        pps->data_size = nal_size;
+    }
+    memcpy(pps->data, gb->buffer, pps->data_size);
+
     // Default values
     pps->loop_filter_across_tiles_enabled_flag = 1;
     pps->num_tile_columns                      = 1;
-- 
2.9.3

