diff options
| author | Jeremy Fitzhardinge | 2007-09-25 11:50:00 -0700 |
|---|---|---|
| committer | Linus Torvalds | 2007-09-26 09:27:14 -0700 |
| commit | df912ea4ae7233d1504fbd861ee127bd7ee5781d (patch) | |
| tree | 69f434d181767ed9661bf96669abbdcfcdfcdf95 | |
| parent | e66485d747505e9d960b864fc6c37f8b2afafaf0 (diff) | |
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>
| -rw-r--r-- | arch/i386/xen/mmu.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/i386/xen/mmu.c b/arch/i386/xen/mmu.c index 4ae038aa6c24..874db0cd1d2a 100644 --- a/arch/i386/xen/mmu.c +++ b/arch/i386/xen/mmu.c @@ -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); } |