From: NeilBrown <neilb@suse.de>
Date: Mon, 18 Aug 2014 03:59:50 +0000 (+1000)
Subject: md/raid10: Fix memory leak when raid10 reshape completes.
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=26584e18c463bcf54fbd97e7c76f6f00ba13b1c9;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

md/raid10: Fix memory leak when raid10 reshape completes.

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@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 973e26fc18c..353c2b39265 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2948,6 +2948,7 @@ 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;
 		}