linux-kernel - [PATCH] mm: page_alloc: place zone id check before VM_BUG_ON

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Message-id: <000001d01383$8e0f1120$aa2d3360$%yang@samsung.com>
Date:	Tue, 09 Dec 2014 15:40:35 +0800
From:	Weijie Yang <weijie.yang@...sung.com>
To:	mgorman@...e.de
Cc:	'Andrew Morton' <akpm@...ux-foundation.org>,
	'Johannes Weiner' <hannes@...xchg.org>,
	'Rik van Riel' <riel@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	'Weijie Yang' <weijie.yang.kh@...il.com>
Subject: [PATCH] mm: page_alloc: place zone id check before VM_BUG_ON_PAGE check

If the free page and its buddy has different zone id, the current
zone->lock cann't prevent buddy page getting allocated, this could
trigger VM_BUG_ON_PAGE in a very tiny chance:

cpu 0:						cpu 1:
hold zone_1 lock
check page and it buddy
PageBuddy(buddy) is true			hold zone_2 lock
page_order(buddy) == order is true		alloc buddy
trigger VM_BUG_ON_PAGE(page_count(buddy) != 0)

This patch fixes this issue by placing the zone id check before
the VM_BUG_ON_PAGE check.

Signed-off-by: Weijie Yang <weijie.yang@...sung.com>
---
 mm/page_alloc.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 616a2c9..491d055 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -488,17 +488,15 @@ static inline int page_is_buddy(struct page *page, struct page *buddy,
 		return 0;
 
 	if (page_is_guard(buddy) && page_order(buddy) == order) {
-		VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy);
-
 		if (page_zone_id(page) != page_zone_id(buddy))
 			return 0;
 
+		VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy);
+
 		return 1;
 	}
 
 	if (PageBuddy(buddy) && page_order(buddy) == order) {
-		VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy);
-
 		/*
 		 * zone check is done late to avoid uselessly
 		 * calculating zone/node ids for pages that could
@@ -507,6 +505,8 @@ static inline int page_is_buddy(struct page *page, struct page *buddy,
 		if (page_zone_id(page) != page_zone_id(buddy))
 			return 0;
 
+		VM_BUG_ON_PAGE(page_count(buddy) != 0, buddy);
+
 		return 1;
 	}
 	return 0;
-- 
1.7.10.4


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