diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-13 09:24:04 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-13 13:31:09 -0700 |
| commit | 3aba3fa070fc0f38de2d41252aee9ff17d2de984 (patch) | |
| tree | 6b349e4360e8079cb8e6317f025c81601311e6a5 | |
| parent | 52423b90e1f5b1bdbbcc6e32f4d37ada29b790c4 (diff) | |
mm: fix missing page table unmap for stack guard page failure case
commit 5528f9132cf65d4d892bcbc5684c61e7822b21e9 upstream.
.. which didn't show up in my tests because it's a no-op on x86-64 and
most other architectures. But we enter the function with the last-level
page table mapped, and should unmap it at exit.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | mm/memory.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c index c43447382fec..aaaedbd2080c 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2792,8 +2792,10 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma, spinlock_t *ptl; pte_t entry; - if (check_stack_guard_page(vma, address) < 0) + if (check_stack_guard_page(vma, address) < 0) { + pte_unmap(page_table); return VM_FAULT_SIGBUS; + } if (!(flags & FAULT_FLAG_WRITE)) { entry = pte_mkspecial(pfn_pte(my_zero_pfn(address), |