Open Radar

 
Instruments v6.1 (56160) and v6.2 (56717) detect a memory leak when creating SecTransformRef with kSecBase32Encoding and using it to encode a data into Base32.

If pass the parameter except kSecBase32Encoding, for example kSecBase64Encoding, does not happen memory leak. This happens only when specify a kSecBase32Encoding.

Steps to Reproduce:
1. Create a new project targeted for Mac application.
2. Type following code in AppDelegate.m.

#import "AppDelegate.h"
#import <Security/Security.h>

@interface AppDelegate ()

@property (weak) IBOutlet NSWindow *window;

@end

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    NSData *data = [@"test" dataUsingEncoding:NSUTF8StringEncoding];
    [self encodeData:data];
}

- (NSData *)encodeData:(NSData *)data {
    SecTransformRef encoder = SecEncodeTransformCreate(kSecBase32Encoding, nil);
    SecTransformSetAttribute(encoder, kSecTransformInputAttributeName, (__bridge CFDataRef)data, nil);
    NSData *encodedData = (__bridge_transfer NSData *)SecTransformExecute(encoder, nil);
    
    CFRelease(encoder);
    
    return encodedData;
}

@end

3. Build and run the project using the Instruments.
4. Choose Leaks template.


Expected Results:
No memory leaks.

Actual Results:
Leaked object Malloc 32 bytes with __EncodeTransform_block_invode60 as responsible caller

Version:
OS X 10.10.2 (14C109)

Xcode 6.1.1 (6A2008a)
Xcode 6.2 (6C107a)
Xcode 6.2 (6C121)

Instruments Version 6.1 (56160)
Instruments Version 6.2 (56717)

Notes:


Configuration:
MacBookPro10,1, 16GB RAM