From: Linus Torvalds Date: Fri, 13 Aug 2010 16:24:04 +0000 (-0700) Subject: mm: fix missing page table unmap for stack guard page failure case X-Git-Tag: firefly_0821_release~10186^2~1119 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ab832422673d1774c4ce3941f2ac87743d73bded;p=firefly-linux-kernel-4.4.55.git 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/mm/memory.c b/mm/memory.c index 92ef198a7670..76d1b2116f9f 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -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),