linux-kernel - [PATCH 3.12 077/111] md/raid5: don't record new size if resize

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Message-Id: <9ad2da11417ffe92aa2daba75c5d13b2481aa6c8.1433943052.git.jslaby@suse.cz>
Date:	Wed, 10 Jun 2015 17:27:06 +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 3.12 077/111] md/raid5: don't record new size if resize_stripes fails.

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

3.12-stable 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: Jiri Slaby <jslaby@...e.cz>
---
 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 09c18062bbc2..4881851c4b42 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -1812,7 +1812,8 @@ 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;
 }
 
-- 
2.4.2

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