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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: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Christian Ostheimer <osth@freesurf.ch>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeremy Fitzhardinge 2007-09-25 11:50:00 -07:00 committed by Linus Torvalds
parent e66485d747
commit df912ea4ae
1 changed files with 4 additions and 1 deletions
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5
arch/i386/xen/mmu.c
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@ -559,6 +559,9 @@ void xen_exit_mmap(struct mm_struct *mm)
put_cpu();
spin_lock(&mm->page_table_lock);
xen_pgd_unpin(mm->pgd);
/* 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);
}