[FFmpeg-cvslog] avcodec/hevcdec: Fix signed integer overflow in decode_lt_rps()

[Michael Niedermayer]

ffmpeg | branch: release/3.1 | Michael Niedermayer <michael at niedermayer.cc> | Sat Jun 17 00:34:08 2017 +0200| [10dc2c48ed0424a3a895e85cb4aa3bdc605bc10d] | committer: Michael Niedermayer

avcodec/hevcdec: Fix signed integer overflow in decode_lt_rps()

Fixes: runtime error: signed integer overflow: 2147483647 + 6 cannot be represented in type 'int'
Fixes: 2263/clusterfuzz-testcase-minimized-4800359627227136

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 1edbf5e20c75f06d6987bc823e63aa4e649ccddd)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=10dc2c48ed0424a3a895e85cb4aa3bdc605bc10d
---

 libavcodec/hevc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libavcodec/hevc.c b/libavcodec/hevc.c
index 3389b7f5c7..c1fa67f67b 100644
--- a/libavcodec/hevc.c
+++ b/libavcodec/hevc.c
@@ -271,12 +271,16 @@ static int decode_lt_rps(HEVCContext *s, LongTermRPS *rps, GetBitContext *gb)
 
         delta_poc_msb_present = get_bits1(gb);
         if (delta_poc_msb_present) {
-            int delta = get_ue_golomb_long(gb);
+            int64_t delta = get_ue_golomb_long(gb);
+            int64_t poc;
 
             if (i && i != nb_sps)
                 delta += prev_delta_msb;
 
-            rps->poc[i] += s->poc - delta * max_poc_lsb - s->sh.pic_order_cnt_lsb;
+            poc = rps->poc[i] + s->poc - delta * max_poc_lsb - s->sh.pic_order_cnt_lsb;
+            if (poc != (int32_t)poc)
+                return AVERROR_INVALIDDATA;
+            rps->poc[i] = poc;
             prev_delta_msb = delta;
         }
     }