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>
This commit is contained in:
parent
320b2b8de1
commit
5528f9132c
|
@ -2792,8 +2792,10 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
|
||||||
spinlock_t *ptl;
|
spinlock_t *ptl;
|
||||||
pte_t entry;
|
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;
|
return VM_FAULT_SIGBUS;
|
||||||
|
}
|
||||||
|
|
||||||
if (!(flags & FAULT_FLAG_WRITE)) {
|
if (!(flags & FAULT_FLAG_WRITE)) {
|
||||||
entry = pte_mkspecial(pfn_pte(my_zero_pfn(address),
|
entry = pte_mkspecial(pfn_pte(my_zero_pfn(address),
|
||||||
|
|
Loading…
Reference in a new issue