[ubsan] PR33081: Skip the standard type checks for volatile
Skip checks for null dereference, alignment violation, object size
violation, and dynamic type violation if the pointer points to volatile
data.
Differential Revision: https://reviews.llvm.org/D34262
llvm-svn: 305546
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index 1582988..7359006 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -549,6 +549,11 @@
if (Ptr->getType()->getPointerAddressSpace())
return;
+ // Don't check pointers to volatile data. The behavior here is implementation-
+ // defined.
+ if (Ty.isVolatileQualified())
+ return;
+
SanitizerScope SanScope(this);
SmallVector<std::pair<llvm::Value *, SanitizerMask>, 3> Checks;