linux-kernel - [155/156] GFS2: Skip check for mandatory locks when unlocking

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Date:	Tue, 30 Mar 2010 15:43:09 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Sachin Prabhu <sprabhu@...hat.com>,
	Steven Whitehouse <swhiteho@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [155/156] GFS2: Skip check for mandatory locks when unlocking

2.6.33-stable review patch.  If anyone has any objections, please let us know.

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

From: Sachin Prabhu <sprabhu@...hat.com>

commit 720e7749279bde0d08684b1bb4e7a2eedeec6394 upstream.

gfs2_lock() will skip locks on file which have mode set to 02666. This is a problem in cases where the mode of the file is changed after a process has obtained a lock on the file. Such a lock will be skipped and will result in a BUG in locks_remove_flock().

gfs2_lock() should skip the check for mandatory locks when unlocking a file.

Signed-off-by: Sachin Prabhu <sprabhu@...hat.com>
Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/gfs2/file.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -640,7 +640,7 @@ static int gfs2_lock(struct file *file,
 
 	if (!(fl->fl_flags & FL_POSIX))
 		return -ENOLCK;
-	if (__mandatory_lock(&ip->i_inode))
+	if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
 		return -ENOLCK;
 
 	if (cmd == F_CANCELLK) {


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