linux-kernel - [PATCH 4.4 102/149] dlm: Fix kobject memleak

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Message-Id: <20200820092130.645244184@linuxfoundation.org>
Date:   Thu, 20 Aug 2020 11:22:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        Wang Hai <wanghai38@...wei.com>,
        David Teigland <teigland@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 102/149] dlm: Fix kobject memleak

From: Wang Hai <wanghai38@...wei.com>

[ Upstream commit 0ffddafc3a3970ef7013696e7f36b3d378bc4c16 ]

Currently the error return path from kobject_init_and_add() is not
followed by a call to kobject_put() - which means we are leaking
the kobject.

Set do_unreg = 1 before kobject_init_and_add() to ensure that
kobject_put() can be called in its error patch.

Fixes: 901195ed7f4b ("Kobject: change GFS2 to use kobject_init_and_add")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Wang Hai <wanghai38@...wei.com>
Signed-off-by: David Teigland <teigland@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/dlm/lockspace.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index b14bb2c460426..499f54f99891c 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -626,6 +626,9 @@ static int new_lockspace(const char *name, const char *cluster,
 	wait_event(ls->ls_recover_lock_wait,
 		   test_bit(LSFL_RECOVER_LOCK, &ls->ls_flags));
 
+	/* let kobject handle freeing of ls if there's an error */
+	do_unreg = 1;
+
 	ls->ls_kobj.kset = dlm_kset;
 	error = kobject_init_and_add(&ls->ls_kobj, &dlm_ktype, NULL,
 				     "%s", ls->ls_name);
@@ -633,9 +636,6 @@ static int new_lockspace(const char *name, const char *cluster,
 		goto out_recoverd;
 	kobject_uevent(&ls->ls_kobj, KOBJ_ADD);
 
-	/* let kobject handle freeing of ls if there's an error */
-	do_unreg = 1;
-
 	/* This uevent triggers dlm_controld in userspace to add us to the
 	   group of nodes that are members of this lockspace (managed by the
 	   cluster infrastructure.)  Once it's done that, it tells us who the
-- 
2.25.1