[analyzer] Malloc: Warn about use-after-free when memory ownership was

transfered with dataWithBytesNoCopy.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158958 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 12 insertions, 8 deletions

diff --git a/test/Analysis/malloc-annotations.c b/test/Analysis/malloc-annotations.c
index 15ce62d9a5..089e53132d 100644
--- a/test/Analysis/malloc-annotations.c
+++ b/test/Analysis/malloc-annotations.c
@@ -124,11 +124,10 @@ void af2e() {
 }
 
 // This case inflicts a possible double-free.
-// TODO: Better error message.
 void af3() {
   int *p = my_malloc(12);
   my_hold(p);
-  free(p); // expected-warning{{Attempt to free released memory}}
+  free(p); // expected-warning{{Attempt to free non-owned memory}}
 }
 
 int * af4() {
diff --git a/test/Analysis/malloc.mm b/test/Analysis/malloc.mm
index 855892da2b..23297ec97c 100644
--- a/test/Analysis/malloc.mm
+++ b/test/Analysis/malloc.mm
@@ -9,7 +9,6 @@ void free(void *);
 void testNSDatafFreeWhenDoneNoError(NSUInteger dataLength) {
   unsigned char *data = (unsigned char *)malloc(42);
   NSData *nsdata = [NSData dataWithBytesNoCopy:data length:dataLength];
-  free(data); // no warning
 }
 
 void testNSDataFreeWhenDoneYES(NSUInteger dataLength) {
@@ -55,11 +54,17 @@ void testNSStringFreeWhenDoneNO2(NSUInteger dataLength) {
   NSString *nsstr = [[NSString alloc] initWithCharactersNoCopy:data length:dataLength freeWhenDone:0]; // expected-warning{{leak}}
 }
 
-// TODO: False Negative.
-void testNSDatafFreeWhenDoneFN(NSUInteger dataLength) {
-  unsigned char *data = (unsigned char *)malloc(42);
-  NSData *nsdata = [NSData dataWithBytesNoCopy:data length:dataLength freeWhenDone:1];
-  free(data); // false negative
+void testRelinquished1() {
+  void *data = malloc(42);
+  NSData *nsdata = [NSData dataWithBytesNoCopy:data length:42 freeWhenDone:1];
+  free(data); // expected-warning {{Attempt to free non-owned memory}}
+}
+
+void testRelinquished2() {
+  void *data = malloc(42);
+  NSData *nsdata;
+  free(data);
+  [NSData dataWithBytesNoCopy:data length:42]; // expected-warning {{Attempt to free released memory}}
 }
 
 // Test CF/NS...NoCopy. PR12100: Pointers can escape when custom deallocators are provided.