linux-kernel - [v2.6.34-stable 030/165] md/linear: avoid corrupting structure while waiting for rcu

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Date:	Wed, 15 Aug 2012 15:46:14 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	<stable@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	NeilBrown <neilb@...e.de>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [v2.6.34-stable 030/165] md/linear: avoid corrupting structure while waiting for rcu_free to complete.

From: NeilBrown <neilb@...e.de>

                   -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
    If you see a problem with using this for longterm, please comment.
                   -------------------

commit 1b6afa17581027218088a18a9ceda600e0ddba7a upstream.

I don't know what I was thinking putting 'rcu' after a dynamically
sized array!  The array could still be in use when we call rcu_free()
(That is the point) so we mustn't corrupt it.

Signed-off-by: NeilBrown <neilb@...e.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 drivers/md/linear.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/linear.h b/drivers/md/linear.h
index 0ce29b6..2f2da05 100644
--- a/drivers/md/linear.h
+++ b/drivers/md/linear.h
@@ -10,9 +10,9 @@ typedef struct dev_info dev_info_t;
 
 struct linear_private_data
 {
+	struct rcu_head		rcu;
 	sector_t		array_sectors;
 	dev_info_t		disks[0];
-	struct rcu_head		rcu;
 };
 
 
-- 
1.7.12.rc2

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