Memory Leak when sending image as an attachment via Email - ios

Question

I have a camera application where the user can share the photos taken through email.
I am using MFMailComposerViewController to send mail. Here is the piece of code.
- (void) contactEmailRecepients:(NSArray *)emailIDs
subject:(NSString *)subject
attachment:(NSMutableDictionary *)attachmentDictionary
sender:(UIViewController *)sender
{
if ([MFMailComposeViewController canSendMail])
{
mailViewController = [[MFMailComposeViewController alloc] init];
mailViewController.mailComposeDelegate = self;
[mailViewController setToRecipients:emailIDs];
[mailViewController setSubject:subject];
NSData *attachmentData = [attachmentDictionary objectForKey:#"attachmentData"];
if (nil != attachmentData)
{
[mailViewController addAttachmentData:attachmentData
mimeType:[attachmentDictionary objectForKey:#"mimeType"]
fileName:[attachmentDictionary objectForKey:#"fileName"]];
}
[sender presentViewController:mailViewController
animated:YES
completion:^{}];
attachmentData = nil;
[attachmentDictionary removeAllObjects];
attachmentDictionary = nil;
}
else
{
// display error message
}
}
My problem is every time I send a mail through my application the VM(Virtual Memory) increases by 6/7 MB. But this does not happen if I comment out following part.
if (nil != attachmentData)
{
[mailViewController addAttachmentData:attachmentData
mimeType:[attachmentDictionary objectForKey:#"mimeType"]
fileName:[attachmentDictionary objectForKey:#"fileName"]];
}
The increased VM is due to CGRasterDataand the responsible library is CoreGraphicsand responsible caller is CGDataProvideCreateWithCopyOfDatawhen I check it through Xcode 5.0.2 instruments.So somewhere a copy is getting created which is not getting released later.I am suspecting the memory allocated to display the image in Email UIActionSheetis not getting released.
Any help is appreciated.
EDIT:
Adding the piece of code where attachmentData is getting initialized.
- (void)postPhotoFromPath:(NSString *)filePath
sender:(UIViewController *)sender
{
NSData *photoData = [NSData dataWithContentsOfFile:filePath];
if (nil == photoData)
{
//display error message
}
else
{
NSString *fileName = [[filePath componentsSeparatedByString:#"/"] lastObject];
[self contactEmailRecepients:nil
subject:nil
attachment:[NSDictionary dictionaryWithObjectsAndKeys:
photoData, #"attachmentData",
#"image/jpeg", #"mimeType",
fileName, #"fileName",
nil]
sender:sender];
}
}
Also I noticed carefully that VM increases exactly when i get the UIActionSheetregarding which image size to send(whether to send the original size or downscaled size). I am attaching the screenshot for the same here.