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>
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@ -559,6 +559,9 @@ void xen_exit_mmap(struct mm_struct *mm)
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put_cpu();
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spin_lock(&mm->page_table_lock);
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xen_pgd_unpin(mm->pgd);
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/* pgd may not be pinned in the error exit path of execve */
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if (PagePinned(virt_to_page(mm->pgd)))
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xen_pgd_unpin(mm->pgd);
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spin_unlock(&mm->page_table_lock);
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}
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