linux-kernel - [PATCH 3.16 117/125] NFSD: Decrease nfsd_users in nfsd_startup

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Date:	Wed,  3 Sep 2014 15:07:54 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Kinglong Mee <kinglongmee@...il.com>,
	"J. Bruce Fields" <bfields@...hat.com>
Subject: [PATCH 3.16 117/125] NFSD: Decrease nfsd_users in nfsd_startup_generic fail

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

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

From: Kinglong Mee <kinglongmee@...il.com>

commit d9499a95716db0d4bc9b67e88fd162133e7d6b08 upstream.

A memory allocation failure could cause nfsd_startup_generic to fail, in
which case nfsd_users wouldn't be incorrectly left elevated.

After nfsd restarts nfsd_startup_generic will then succeed without doing
anything--the first consequence is likely nfs4_start_net finding a bad
laundry_wq and crashing.

Signed-off-by: Kinglong Mee <kinglongmee@...il.com>
Fixes: 4539f14981ce "nfsd: replace boolean nfsd_up flag by users counter"
Signed-off-by: J. Bruce Fields <bfields@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfsd/nfssvc.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -221,7 +221,8 @@ static int nfsd_startup_generic(int nrse
 	 */
 	ret = nfsd_racache_init(2*nrservs);
 	if (ret)
-		return ret;
+		goto dec_users;
+
 	ret = nfs4_state_start();
 	if (ret)
 		goto out_racache;
@@ -229,6 +230,8 @@ static int nfsd_startup_generic(int nrse

 out_racache:
 	nfsd_racache_shutdown();
+dec_users:
+	nfsd_users--;
 	return ret;
 }

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