Fix: <rdar://problem/7261075> [RegionStore] crash when handling load: '*((unsigned...

This issue was originally reported via personal email by Thomas Clement!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@83069 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Analysis/RegionStore.cpp b/lib/Analysis/RegionStore.cpp
index 9fe41bed2a3649bdd15fb3f6f2e0d73d38666c44..f63e9d874e03548e0956611c92c29cdaeec79ebf 100644 (file)
--- a/lib/Analysis/RegionStore.cpp
+++ b/lib/Analysis/RegionStore.cpp
@@ -1060,6 +1060,13 @@ SVal RegionStoreManager::RetrieveElement(const GRState* state,
 
   // Check if the region is an element region of a string literal.
   if (const StringRegion *StrR=dyn_cast<StringRegion>(superR)) {
+    // FIXME: Handle loads from strings where the literal is treated as 
+    // an integer, e.g., *((unsigned int*)"hello")
+    ASTContext &Ctx = getContext();
+    QualType T = StrR->getValueType(Ctx)->getAs<ArrayType>()->getElementType();
+    if (T != Ctx.getCanonicalType(R->getElementType()))
+      return UnknownVal();
+    
     const StringLiteral *Str = StrR->getStringLiteral();
     SVal Idx = R->getIndex();
     if (nonloc::ConcreteInt *CI = dyn_cast<nonloc::ConcreteInt>(&Idx)) {
@@ -1072,7 +1079,7 @@ SVal RegionStoreManager::RetrieveElement(const GRState* state,
         return UnknownVal();
       }
       char c = (i == byteLength) ? '\0' : Str->getStrData()[i];
-      return ValMgr.makeIntVal(c, getContext().CharTy);
+      return ValMgr.makeIntVal(c, T);
     }
   }
 

diff --git a/test/Analysis/misc-ps-region-store.m b/test/Analysis/misc-ps-region-store.m
index 66f01fc7b31277bcc55ded41ae4ccca15795630d..24ebe5b236e4b21615ad6b9bb4fba4ce1cd81a21 100644 (file)
--- a/test/Analysis/misc-ps-region-store.m
+++ b/test/Analysis/misc-ps-region-store.m
@@ -278,3 +278,12 @@ int test_handle_array_wrapper() {
   return p->z;  // no-warning
 }
 
+// <rdar://problem/7261075> [RegionStore] crash when 
+//   handling load: '*((unsigned int *)"????")'
+int rdar_7261075(void) {
+  unsigned int var = 0;
+  if (var == *((unsigned int *)"????"))
+    return 1;
+  return 0;
+}
+