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Fix UBSan report in StringMap implementation.

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Use offsetof() instead of a member access within null pointer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223402 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov 2014-12-04 22:45:31 +00:00
parent fb8dcb45c6
commit 8bc0067071
1 changed files with 1 additions and 4 deletions
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5
include/llvm/ADT/StringMap.h
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@ -182,10 +182,7 @@ public:
/// GetStringMapEntryFromValue - Given a value that is known to be embedded
/// into a StringMapEntry, return the StringMapEntry itself.
static StringMapEntry &GetStringMapEntryFromValue(ValueTy &V) {
StringMapEntry *EPtr = 0;
char *Ptr = reinterpret_cast<char*>(&V) -
(reinterpret_cast<char*>(&EPtr->second) -
reinterpret_cast<char*>(EPtr));
char *Ptr = reinterpret_cast<char *>(&V) - offsetof(StringMapEntry, second);
return *reinterpret_cast<StringMapEntry*>(Ptr);
}
static const StringMapEntry &GetStringMapEntryFromValue(const ValueTy &V) {