Side effect of imageWithData creates CGColorSpaceRef which is not released IOS 6 only

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Based on analysis with Instruments in IOS6.0.1, The number of Malloc 1kb object keeps growing, of the type colour_space_create_indexed. Instruments indicate there source is In RMAbstractWebMapSource image = [UIImage imageWithData:tileData]. However, I have noticed the same behaviour with other imageWithData (RMDatabaseCache). This symptom is not visible in IOS 5.2, making me thinks its a bug in 6._

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Just tested with 6.1 seed 4 with iphone simulator 6.1. Problem still persists.

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Can anybody else confirm that what I am seeing is real !! Have tested with MarkerMurder sample app on latest Xcode, and released 6.1 on an ipad4. When you do a lot of panning/zooming both number of CFData and Malloc 1.00kb objects grow fast. GC deletes extras DFData's, but growing number of Malloc 1.00kb object in form of color_space_create_indexed remain. If this is real, it is a serious memory eater.