Index: lib/StaticAnalyzer/Checkers/CStringChecker.cpp
===================================================================
--- lib/StaticAnalyzer/Checkers/CStringChecker.cpp
+++ lib/StaticAnalyzer/Checkers/CStringChecker.cpp
@@ -920,7 +920,7 @@
     // Invalidate and escape only indirect regions accessible through the source
     // buffer.
     if (IsSourceBuffer) {
-      ITraits.setTrait(R,
+      ITraits.setTrait(R->getBaseRegion(),
                        RegionAndSymbolInvalidationTraits::TK_PreserveContents);
       ITraits.setTrait(R, RegionAndSymbolInvalidationTraits::TK_SuppressEscape);
       CausesPointerEscape = true;
Index: lib/StaticAnalyzer/Core/CallEvent.cpp
===================================================================
--- lib/StaticAnalyzer/Core/CallEvent.cpp
+++ lib/StaticAnalyzer/Core/CallEvent.cpp
@@ -177,7 +177,7 @@
     // below for efficiency.
     if (PreserveArgs.count(Idx))
       if (const MemRegion *MR = getArgSVal(Idx).getAsRegion())
-        ETraits.setTrait(MR->StripCasts(),
+        ETraits.setTrait(MR->getBaseRegion(),
                         RegionAndSymbolInvalidationTraits::TK_PreserveContents);
         // TODO: Factor this out + handle the lower level const pointers.
 
Index: test/Analysis/call-invalidation.cpp
===================================================================
--- test/Analysis/call-invalidation.cpp
+++ test/Analysis/call-invalidation.cpp
@@ -118,3 +118,47 @@
 }
 
 
+struct PlainStruct {
+  int x, y;
+  mutable int z;
+};
+
+PlainStruct glob;
+
+void useAnything(void *);
+void useAnythingConst(const void *);
+
+void testInvalidationThroughBaseRegionPointer() {
+  PlainStruct s1;
+  s1.x = 1;
+  s1.z = 1;
+  clang_analyzer_eval(s1.x == 1); // expected-warning{{TRUE}}
+  clang_analyzer_eval(s1.z == 1); // expected-warning{{TRUE}}
+  useAnythingConst(&(s1.y));
+  clang_analyzer_eval(s1.x == 1); // expected-warning{{TRUE}}
+  // FIXME: Should say "UNKNOWN", because it is not uncommon to
+  // modify a mutable member variable through const pointer.
+  clang_analyzer_eval(s1.z == 1); // expected-warning{{TRUE}}
+  useAnything(&(s1.y));
+  clang_analyzer_eval(s1.x == 1); // expected-warning{{UNKNOWN}}
+}
+
+
+void useFirstConstSecondNonConst(const void *x, void *y);
+void useFirstNonConstSecondConst(void *x, const void *y);
+
+void testMixedConstNonConstCalls() {
+  PlainStruct s2;
+  s2.x = 1;
+  useFirstConstSecondNonConst(&(s2.x), &(s2.y));
+  clang_analyzer_eval(s2.x == 1); // expected-warning{{UNKNOWN}}
+  s2.x = 1;
+  useFirstNonConstSecondConst(&(s2.x), &(s2.y));
+  clang_analyzer_eval(s2.x == 1); // expected-warning{{UNKNOWN}}
+  s2.y = 1;
+  useFirstConstSecondNonConst(&(s2.x), &(s2.y));
+  clang_analyzer_eval(s2.y == 1); // expected-warning{{UNKNOWN}}
+  s2.y = 1;
+  useFirstNonConstSecondConst(&(s2.x), &(s2.y));
+  clang_analyzer_eval(s2.y == 1); // expected-warning{{UNKNOWN}}
+}