[analyzer] Fix a false positive reported on rare strange code, which happens to be in JSONKit

llvm-svn: 183055

clang/lib/StaticAnalyzer/Checkers/MallocChecker.cpp

@@ -1890,6 +1890,12 @@ bool MallocChecker::doesNotFreeMemOrInteresting(const CallEvent *Call,
       return false;
     }
 
+    // We should escape on call to 'init'. This is especially relevant to the
+    // receiver, as the corresponding symbol is usually not referenced after
+    // the call.
+    if (Msg->getMethodFamily() == OMF_init)
+      return false;
+
     // Otherwise, assume that the method does not free memory.
     // Most framework methods do not free memory.
     return true;

clang/test/Analysis/malloc.m

@@ -35,3 +35,13 @@ void rdar10579586(char x);
 }
 @end
 
+@interface JKArray : NSObject {
+  id * objects;
+}
+@end
+
+void _JKArrayCreate() {
+  JKArray *array = (JKArray *)malloc(12);
+  array = [array init];
+  free(array); // no-warning
+}