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mm: fix missing page table unmap for stack guard page failure case

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commit 5528f9132c 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>
This commit is contained in:
Linus Torvalds
2010-08-13 09:24:04 -07:00
committed by Greg Kroah-Hartman
parent 7e281afe24
commit ab83242267
1 changed files with 3 additions and 1 deletions
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4
mm/memory.c
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@@ -2662,8 +2662,10 @@ 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),