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Commit df912ea4 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Linus Torvalds
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xen: execve's error paths don't pin the mm before unpinning 



execve's error paths don't activate (and therefore pin) the mm before
calling exit_mmap to free it up, so don't try to unpin unless it is
actually pinned.  This prevents a BUG_ON from triggering.

Signed-off-by: default avatarJeremy Fitzhardinge <jeremy@xensource.com>
Cc: Christian Ostheimer <osth@freesurf.ch>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e66485d7

arch/i386/xen/mmu.c

+4 −1
Original line number Diff line number Diff line
@@ -559,6 +559,9 @@ void xen_exit_mmap(struct mm_struct *mm) 
	put_cpu();



	spin_lock(&mm->page_table_lock);



	/* pgd may not be pinned in the error exit path of execve */

	if (PagePinned(virt_to_page(mm->pgd)))

		xen_pgd_unpin(mm->pgd);

	spin_unlock(&mm->page_table_lock);

}