From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date: Wed, 29 Nov 2017 13:34:50 +0000 (+0900)
Subject: quota: Check for register_shrinker() failure.
X-Git-Tag: v3.18.94~18
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=33e592e7a793bd73c59c53f2cc4f0ca25c978c69;p=thirdparty%2Fkernel%2Fstable.git

quota: Check for register_shrinker() failure.


[ Upstream commit 88bc0ede8d35edc969350852894dc864a2dc1859 ]

register_shrinker() might return -ENOMEM error since Linux 3.12.
Call panic() as with other failure checks in this function if
register_shrinker() failed.

Fixes: 1d3d4437eae1 ("vmscan: per-node deferred work")
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Jan Kara <jack@suse.com>
Cc: Michal Hocko <mhocko@suse.com>
Reviewed-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 18aaccb290c29..a9b448e8f92dd 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -2730,7 +2730,8 @@ static int __init dquot_init(void)
 	printk("Dquot-cache hash table entries: %ld (order %ld, %ld bytes)\n",
 			nr_hash, order, (PAGE_SIZE << order));
 
-	register_shrinker(&dqcache_shrinker);
+	if (register_shrinker(&dqcache_shrinker))
+		panic("Cannot register dquot shrinker");
 
 	return 0;
 }