linux-kernel - [PATCH 3.4 087/146] md/raid5: don't record new size if resize

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Message-Id: <1442307861-32031-87-git-send-email-lizf@kernel.org>
Date:	Tue, 15 Sep 2015 17:03:22 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, NeilBrown <neilb@...e.de>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 087/146] md/raid5: don't record new size if resize_stripes fails.

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

3.4.109-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 6e9eac2dcee5e19f125967dd2be3e36558c42fff upstream.

If any memory allocation in resize_stripes fails we will return
-ENOMEM, but in some cases we update conf->pool_size anyway.

This means that if we try again, the allocations will be assumed
to be larger than they are, and badness results.

So only update pool_size if there is no error.

This bug was introduced in 2.6.17 and the patch is suitable for
-stable.

Fixes: ad01c9e3752f ("[PATCH] md: Allow stripes to be expanded in preparation for expanding an array")
Signed-off-by: NeilBrown <neilb@...e.de>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/md/raid5.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index c276ad0..7a218e8 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1622,7 +1622,8 @@ static int resize_stripes(struct r5conf *conf, int newsize)
 
 	conf->slab_cache = sc;
 	conf->active_name = 1-conf->active_name;
-	conf->pool_size = newsize;
+	if (!err)
+		conf->pool_size = newsize;
 	return err;
 }
 
-- 
1.9.1

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