alexshap updated this revision to Diff 130979.
Repository:
rL LLVM
https://reviews.llvm.org/D42396
Files:
lib/StaticAnalyzer/Core/PathDiagnostic.cpp
test/Analysis/malloc.c
Index: test/Analysis/malloc.c
===================================================================
--- test/Analysis/malloc.c
+++ test/Analysis/malloc.c
@@ -1786,6 +1786,18 @@
free(p);
}
+void allocateSomeMemory(void *offendingParameter, void **ptr) {
+ *ptr = malloc(1);
+}
+
+void testNoCrashOnOffendingParameter() {
+ // "extern" is necessary to avoid unrelated warnings
+ // on passing uninitialized value.
+ extern void *offendingParameter;
+ void* ptr;
+ allocateSomeMemory(offendingParameter, &ptr);
+} // expected-warning {{Potential leak of memory pointed to by 'ptr'}}
+
// ----------------------------------------------------------------------------
// False negatives.
Index: lib/StaticAnalyzer/Core/PathDiagnostic.cpp
===================================================================
--- lib/StaticAnalyzer/Core/PathDiagnostic.cpp
+++ lib/StaticAnalyzer/Core/PathDiagnostic.cpp
@@ -1211,6 +1211,9 @@
// Check if the parameter is a pointer to the symbol.
if (Optional<loc::MemRegionVal> Reg = SV.getAs<loc::MemRegionVal>()) {
+ // Do not attempt to dereference void*.
+ if ((*I)->getType()->isVoidPointerType())
+ continue;
SVal PSV = N->getState()->getSVal(Reg->getRegion());
SymbolRef AS = PSV.getAsLocSymbol();
if (AS == Sym) {
Index: test/Analysis/malloc.c
===================================================================
--- test/Analysis/malloc.c
+++ test/Analysis/malloc.c
@@ -1786,6 +1786,18 @@
free(p);
}
+void allocateSomeMemory(void *offendingParameter, void **ptr) {
+ *ptr = malloc(1);
+}
+
+void testNoCrashOnOffendingParameter() {
+ // "extern" is necessary to avoid unrelated warnings
+ // on passing uninitialized value.
+ extern void *offendingParameter;
+ void* ptr;
+ allocateSomeMemory(offendingParameter, &ptr);
+} // expected-warning {{Potential leak of memory pointed to by 'ptr'}}
+
// ----------------------------------------------------------------------------
// False negatives.
Index: lib/StaticAnalyzer/Core/PathDiagnostic.cpp
===================================================================
--- lib/StaticAnalyzer/Core/PathDiagnostic.cpp
+++ lib/StaticAnalyzer/Core/PathDiagnostic.cpp
@@ -1211,6 +1211,9 @@
// Check if the parameter is a pointer to the symbol.
if (Optional<loc::MemRegionVal> Reg = SV.getAs<loc::MemRegionVal>()) {
+ // Do not attempt to dereference void*.
+ if ((*I)->getType()->isVoidPointerType())
+ continue;
SVal PSV = N->getState()->getSVal(Reg->getRegion());
SymbolRef AS = PSV.getAsLocSymbol();
if (AS == Sym) {
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