[x265] [PATCH] deblock: set reference frame to NULL if refIdx < 0. Dereferencing refFrameList when

[santhoshini at multicorewareinc.com]

# HG changeset patch
# User Santhoshini Sekar <santhoshini at multicorewareinc.com>
# Date 1512043592 -19800
#      Thu Nov 30 17:36:32 2017 +0530
# Branch stable
# Node ID f9d08feabf7b2607561d337e5048657a786a7c68
# Parent  b0d89eaaebcf3534204e054243d402b6cf646234
deblock: set reference frame to NULL if refIdx < 0. Dereferencing refFrameList when
refIdx < 0 is not valid

diff --git a/source/common/deblock.cpp b/source/common/deblock.cpp
--- a/source/common/deblock.cpp
+++ b/source/common/deblock.cpp
@@ -208,8 +208,8 @@
     const Slice* const sliceQ = cuQ->m_slice;
     const Slice* const sliceP = cuP->m_slice;
 
-    const Frame* refP0 = sliceP->m_refFrameList[0][cuP->m_refIdx[0][partP]];
-    const Frame* refQ0 = sliceQ->m_refFrameList[0][cuQ->m_refIdx[0][partQ]];
+    const Frame* refP0 = (cuP->m_refIdx[0][partP] >= 0) ? sliceP->m_refFrameList[0][cuP->m_refIdx[0][partP]] : NULL;
+    const Frame* refQ0 = (cuQ->m_refIdx[0][partQ] >= 0) ? sliceQ->m_refFrameList[0][cuQ->m_refIdx[0][partQ]] : NULL;
     const MV& mvP0 = refP0 ? cuP->m_mv[0][partP] : zeroMv;
     const MV& mvQ0 = refQ0 ? cuQ->m_mv[0][partQ] : zeroMv;
 
@@ -220,8 +220,8 @@
     }
 
     // (sliceQ->isInterB() || sliceP->isInterB())
-    const Frame* refP1 = sliceP->m_refFrameList[1][cuP->m_refIdx[1][partP]];
-    const Frame* refQ1 = sliceQ->m_refFrameList[1][cuQ->m_refIdx[1][partQ]];
+    const Frame* refP1 = (cuP->m_refIdx[1][partP] >= 0) ? sliceP->m_refFrameList[1][cuP->m_refIdx[1][partP]] : NULL;
+    const Frame* refQ1 = (cuQ->m_refIdx[1][partQ] >= 0) ? sliceQ->m_refFrameList[1][cuQ->m_refIdx[1][partQ]] : NULL;
     const MV& mvP1 = refP1 ? cuP->m_mv[1][partP] : zeroMv;
     const MV& mvQ1 = refQ1 ? cuQ->m_mv[1][partQ] : zeroMv;
 
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