linux-kernel - [PATCH 3.12 096/142] md/raid10: Fix memory leak when raid10 reshape completes.

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Date:	Fri, 26 Sep 2014 11:45:07 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, NeilBrown <neilb@...e.de>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 096/142] md/raid10: Fix memory leak when raid10 reshape completes.

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

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit b39685526f46976bcd13aa08c82480092befa46c upstream.

When a raid10 commences a resync/recovery/reshape it allocates
some buffer space.
When a resync/recovery completes the buffer space is freed.  But not
when the reshape completes.
This can result in a small memory leak.

There is a subtle side-effect of this bug.  When a RAID10 is reshaped
to a larger array (more devices), the reshape is immediately followed
by a "resync" of the new space.  This "resync" will use the buffer
space which was allocated for "reshape".  This can cause problems
including a "BUG" in the SCSI layer.  So this is suitable for -stable.

Fixes: 3ea7daa5d7fde47cd41f4d56c2deb949114da9d6
Signed-off-by: NeilBrown <neilb@...e.de>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/md/raid10.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index d1cf7734e55e..9ccb107c982e 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2969,6 +2969,7 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
 		 */
 		if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) {
 			end_reshape(conf);
+			close_sync(conf);
 			return 0;
 		}

-- 
2.1.0

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