[analyzer] Malloc: Allow a pointer to escape through OSAtomicEnqueue.

llvm-svn: 153453

2 files changed, 13 insertions, 1 deletions

diff --git a/clang/lib/StaticAnalyzer/Checkers/MallocChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/MallocChecker.cpp
index 5eca9178ad9..7b9adb7c157 100644
--- a/clang/lib/StaticAnalyzer/Checkers/MallocChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/MallocChecker.cpp
@@ -1257,7 +1257,8 @@ bool MallocChecker::doesNotFreeMemory(const CallOrObjCMessage *Call,
     // this would be to implement a pointer escapes callback.
     if (FName == "CVPixelBufferCreateWithBytes" ||
         FName == "CGBitmapContextCreateWithData" ||
-        FName == "CVPixelBufferCreateWithPlanarBytes") {
+        FName == "CVPixelBufferCreateWithPlanarBytes" ||
+        FName == "OSAtomicEnqueue") {
       return false;
     }
 
diff --git a/clang/test/Analysis/malloc.mm b/clang/test/Analysis/malloc.mm
index 4cb2cfa328a..fe14edeedd1 100644
--- a/clang/test/Analysis/malloc.mm
+++ b/clang/test/Analysis/malloc.mm
@@ -106,3 +106,14 @@ void testBlocks() {
   myBlock(3);
 }
 
+// Test that we handle pointer escaping through OSAtomicEnqueue.
+typedef volatile struct {
+ void *opaque1;
+ long opaque2;
+} OSQueueHead;
+void OSAtomicEnqueue( OSQueueHead *__list, void *__new, size_t __offset) __attribute__((weak_import));
+static inline void radar11111210(OSQueueHead *pool) {
+    void *newItem = malloc(4);
+    OSAtomicEnqueue(pool, newItem, 4);
+}
+