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Created attachment 633 [details]
Test program

CGDataProviderRef must be cleaned after usage.

Here is a proposed patch:
{{{
diff -r b1c1ec3a8d49 IMG_ImageIO.c
--- a/IMG_ImageIO.c	Thu Apr 07 07:50:52 2011 -0700
+++ b/IMG_ImageIO.c	Fri Jun 24 13:45:18 2011 +0700
@@ -103,6 +103,7 @@
 	// Get the CGImageSourceRef.
 	// The dictionary can be NULL or contain hints to help ImageIO figure out the image type.
 	source_ref = CGImageSourceCreateWithDataProvider(data_provider, hints_and_options);
+	CGDataProviderRelease(data_provider);
 	return source_ref;
 }
 
}}}

Attached are test program and valgrind's logfiles