[FFmpeg-cvslog] avcodec/hevc_cabac: Fix integer overflow in ff_hevc_cu_qp_delta_abs()

[Michael Niedermayer]

ffmpeg | branch: release/3.4 | Michael Niedermayer <michael at niedermayer.cc> | Fri Dec 15 18:17:13 2017 +0100| [0288d15cdded73991b72c1407e98654a295a09ae] | committer: Michael Niedermayer

avcodec/hevc_cabac: Fix integer overflow in ff_hevc_cu_qp_delta_abs()

Fixes: signed integer overflow: 2147483647 + 1073741824 cannot be represented in type 'int'
Fixes: 4555/clusterfuzz-testcase-minimized-4505532481142784

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 0ee143558d55b590774dba69cff5a16eda089a4d)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0288d15cdded73991b72c1407e98654a295a09ae
---

 libavcodec/hevc_cabac.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavcodec/hevc_cabac.c b/libavcodec/hevc_cabac.c
index 853fd3f722..5b5da1165a 100644
--- a/libavcodec/hevc_cabac.c
+++ b/libavcodec/hevc_cabac.c
@@ -646,8 +646,10 @@ int ff_hevc_cu_qp_delta_abs(HEVCContext *s)
             suffix_val += 1 << k;
             k++;
         }
-        if (k == CABAC_MAX_BIN)
+        if (k == CABAC_MAX_BIN) {
             av_log(s->avctx, AV_LOG_ERROR, "CABAC_MAX_BIN : %d\n", k);
+            return AVERROR_INVALIDDATA;
+        }
 
         while (k--)
             suffix_val += get_cabac_bypass(&s->HEVClc->cc) << k;