From patchwork Thu Dec 6 03:24:58 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Herton Ronaldo Krzesinski X-Patchwork-Id: 204122 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from chlorine.canonical.com (chlorine.canonical.com [91.189.94.204]) by ozlabs.org (Postfix) with ESMTP id 342E32C0156 for ; Thu, 6 Dec 2012 14:25:12 +1100 (EST) Received: from localhost ([127.0.0.1] helo=chlorine.canonical.com) by chlorine.canonical.com with esmtp (Exim 4.71) (envelope-from ) id 1TgS5B-0004cG-QN; Thu, 06 Dec 2012 03:25:05 +0000 Received: from youngberry.canonical.com ([91.189.89.112]) by chlorine.canonical.com with esmtp (Exim 4.71) (envelope-from ) id 1TgS59-0004av-HI for kernel-team@lists.ubuntu.com; Thu, 06 Dec 2012 03:25:03 +0000 Received: from [177.16.122.79] (helo=canonical.com) by youngberry.canonical.com with esmtpsa (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1TgS58-0005Ij-14; Thu, 06 Dec 2012 03:25:02 +0000 From: Herton Ronaldo Krzesinski To: Takamori Yamaguchi Subject: [ 3.5.y.z extended stable ] Patch "mm: bugfix: set current->reclaim_state to NULL while" has been added to staging queue Date: Thu, 6 Dec 2012 01:24:58 -0200 Message-Id: <1354764298-29631-1-git-send-email-herton.krzesinski@canonical.com> X-Mailer: git-send-email 1.7.9.5 Cc: kernel-team@lists.ubuntu.com, David Rientjes , Andrew Morton , Aaditya Kumar , Linus Torvalds X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.13 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: kernel-team-bounces@lists.ubuntu.com Errors-To: kernel-team-bounces@lists.ubuntu.com This is a note to let you know that I have just added a patch titled mm: bugfix: set current->reclaim_state to NULL while to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.5.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Herton ------ From 7115a7b18b958293129fd2ea2d8848e4b1ecbc48 Mon Sep 17 00:00:00 2001 From: Takamori Yamaguchi Date: Thu, 8 Nov 2012 15:53:39 -0800 Subject: [PATCH] mm: bugfix: set current->reclaim_state to NULL while returning from kswapd() X-Extended-Stable: 3.5 commit b0a8cc58e6b9aaae3045752059e5e6260c0b94bc upstream. In kswapd(), set current->reclaim_state to NULL before returning, as current->reclaim_state holds reference to variable on kswapd()'s stack. In rare cases, while returning from kswapd() during memory offlining, __free_slab() and freepages() can access the dangling pointer of current->reclaim_state. Signed-off-by: Takamori Yamaguchi Signed-off-by: Aaditya Kumar Acked-by: David Rientjes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Herton Ronaldo Krzesinski --- mm/vmscan.c | 2 ++ 1 file changed, 2 insertions(+) -- 1.7.9.5 diff --git a/mm/vmscan.c b/mm/vmscan.c index f0f8ebb..cdfdfc5 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -2835,6 +2835,8 @@ static int kswapd(void *p) &balanced_classzone_idx); } } + + current->reclaim_state = NULL; return 0; }