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>
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@ -2792,8 +2792,10 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
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spinlock_t *ptl;
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pte_t entry;
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if (check_stack_guard_page(vma, address) < 0)
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if (check_stack_guard_page(vma, address) < 0) {
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pte_unmap(page_table);
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return VM_FAULT_SIGBUS;
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}
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if (!(flags & FAULT_FLAG_WRITE)) {
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entry = pte_mkspecial(pfn_pte(my_zero_pfn(address),
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