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In case a race was detected during allocation of a new p2m tree element in alloc_p2m() the new allocated mid_mfn page is freed without updating the pointer to the found value in the tree. This will result in overwriting the just freed page with the mfn of the p2m leaf. Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>