[FFmpeg-cvslog] hevc: check that VPS referenced from SPS exists

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Fri Jan 10 21:32:04 2014 +0100| [a7a07cc98ac548297b5b0628cb81280e11952e3f] | committer: Luca Barbato

hevc: check that VPS referenced from SPS exists

This matches how its done for SPS/PPS.
Fixes null pointer dereference.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Luca Barbato <lu_zero at gentoo.org>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a7a07cc98ac548297b5b0628cb81280e11952e3f
---

 libavcodec/hevc_ps.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libavcodec/hevc_ps.c b/libavcodec/hevc_ps.c
index 372ce28..1ce8d2e 100644
--- a/libavcodec/hevc_ps.c
+++ b/libavcodec/hevc_ps.c
@@ -633,6 +633,13 @@ int ff_hevc_decode_nal_sps(HEVCContext *s)
         goto err;
     }
 
+    if (!s->vps_list[sps->vps_id]) {
+        av_log(s->avctx, AV_LOG_ERROR, "VPS %d does not exist\n",
+               sps->vps_id);
+        ret = AVERROR_INVALIDDATA;
+        goto err;
+    }
+
     sps->max_sub_layers = get_bits(gb, 3) + 1;
     if (sps->max_sub_layers > MAX_SUB_LAYERS) {
         av_log(s->avctx, AV_LOG_ERROR, "sps_max_sub_layers out of range: %d\n",