From: Linus Torvalds <torvalds@linux-foundation.org>
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: upstream/snapshot3+hdmi~13263
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5528f9132cf65d4d892bcbc5684c61e7822b21e9;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

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>
---

diff --git a/mm/memory.c b/mm/memory.c
index 9606ceb..9b3b73f 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),