[FFmpeg-cvslog] avcodec/hevc_ps: Fix runtime error: index 32 out of bounds for type 'uint8_t [32]'

[Michael Niedermayer]

ffmpeg | branch: release/3.1 | Michael Niedermayer <michael at niedermayer.cc> | Sun Jun  4 17:06:27 2017 +0200| [278b8d18ad297b0841a22f9f6aca5efe0c33eb6f] | committer: Michael Niedermayer

avcodec/hevc_ps: Fix runtime error: index 32 out of bounds for type 'uint8_t [32]'

Fixes: 2010/clusterfuzz-testcase-minimized-6209288450080768

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 29808fff339da3e0f26131f7a6209b853947a54b)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=278b8d18ad297b0841a22f9f6aca5efe0c33eb6f
---

 libavcodec/hevc_ps.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavcodec/hevc_ps.c b/libavcodec/hevc_ps.c
index 895046722f..4b2a6244ee 100644
--- a/libavcodec/hevc_ps.c
+++ b/libavcodec/hevc_ps.c
@@ -169,6 +169,12 @@ int ff_hevc_decode_short_term_rps(GetBitContext *gb, AVCodecContext *avctx,
             }
         }
 
+        if (k >= FF_ARRAY_ELEMS(rps->used)) {
+            av_log(avctx, AV_LOG_ERROR,
+                   "Invalid num_delta_pocs: %d\n", k);
+            return AVERROR_INVALIDDATA;
+        }
+
         rps->num_delta_pocs    = k;
         rps->num_negative_pics = k0;
         // sort in increasing order (smallest first)