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From: Pavel Machek <pavel@ucw.cz>
To: trivial@kernel.org, mark@fasheh.com, jlbec@evilplan.org,
	joseph.qi@linux.alibaba.com, ocfs2-devel@oss.oracle.com,
	linux-kernel@vger.kernel.org,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: [PATCH] ocfs2: fix unbalanced locking
Date: Fri, 24 Jul 2020 14:44:43 +0200
Message-ID: <20200724124443.GA28164@duo.ucw.cz> (raw)


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Based on what fails, function can return with nfs_sync_rwlock either
locked or unlocked. That can not be right.

Always return with lock unlocked on error.

Signed-off-by: Pavel Machek (CIP) <pavel@denx.de>

diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 751bc4dc7466..8e3a369086db 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -2871,9 +2871,15 @@ int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex)
 
 	status = ocfs2_cluster_lock(osb, lockres, ex ? LKM_EXMODE : LKM_PRMODE,
 				    0, 0);
-	if (status < 0)
+	if (status < 0) {
 		mlog(ML_ERROR, "lock on nfs sync lock failed %d\n", status);
 
+		if (ex)
+			up_write(&osb->nfs_sync_rwlock);
+		else
+			up_read(&osb->nfs_sync_rwlock);
+	}
+
 	return status;
 }
 

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-24 12:44 Pavel Machek [this message]
2020-07-27  7:15 ` Joseph Qi

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