From 07601a90086ab06da9a27a237b1bbedf51801870 Mon Sep 17 00:00:00 2001
From: Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>
Date: Tue, 9 Jan 2018 15:38:23 +0000
Subject: [PATCH] fix_copyChars_segfault

Gbp-Pq: Name fix_copyChars_segfault.diff
---
 Source/WTF/wtf/text/StringImpl.h | 23 +----------------------
 1 file changed, 1 insertion(+), 22 deletions(-)

diff --git a/Source/WTF/wtf/text/StringImpl.h b/Source/WTF/wtf/text/StringImpl.h
index 5781c1c0..a1be7563 100644
--- a/Source/WTF/wtf/text/StringImpl.h
+++ b/Source/WTF/wtf/text/StringImpl.h
@@ -619,25 +619,7 @@ public:
             *destination = *source;
             return;
         }
-
-        if (numCharacters <= s_copyCharsInlineCutOff) {
-            unsigned i = 0;
-#if (CPU(X86) || CPU(X86_64))
-            const unsigned charsPerInt = sizeof(uint32_t) / sizeof(T);
-
-            if (numCharacters > charsPerInt) {
-                unsigned stopCount = numCharacters & ~(charsPerInt - 1);
-
-                const uint32_t* srcCharacters = reinterpret_cast<const uint32_t*>(source);
-                uint32_t* destCharacters = reinterpret_cast<uint32_t*>(destination);
-                for (unsigned j = 0; i < stopCount; i += charsPerInt, ++j)
-                    destCharacters[j] = srcCharacters[j];
-            }
-#endif
-            for (; i < numCharacters; ++i)
-                destination[i] = source[i];
-        } else
-            memcpy(destination, source, numCharacters * sizeof(T));
+        memcpy(destination, source, numCharacters * sizeof(T));
     }
 
     ALWAYS_INLINE static void copyChars(UChar* destination, const LChar* source, unsigned numCharacters)
@@ -855,9 +837,6 @@ private:
         return *tailPointer<StringImpl*>();
     }
 
-    // This number must be at least 2 to avoid sharing empty, null as well as 1 character strings from SmallStrings.
-    static const unsigned s_copyCharsInlineCutOff = 20;
-
     enum class CaseConvertType { Upper, Lower };
     template<CaseConvertType type, typename CharacterType> static Ref<StringImpl> convertASCIICase(StringImpl&, const CharacterType*, unsigned);
 
-- 
2.30.2