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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-13 18:24:04 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-13 18:24:04 +0200 |
| commit | 5528f9132cf65d4d892bcbc5684c61e7822b21e9 (patch) | |
| tree | 46ad9b7a106a42579b869b42bf237a663370a613 /mm/memory.c | |
| parent | mm: keep a guard page below a grow-down stack segment (diff) | |
| download | linux-5528f9132cf65d4d892bcbc5684c61e7822b21e9.tar.xz linux-5528f9132cf65d4d892bcbc5684c61e7822b21e9.zip | |
mm: fix missing page table unmap for stack guard page failure case
.. 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>
Diffstat (limited to 'mm/memory.c')
| -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 9606ceb3c165..9b3b73f4ae9c 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), |