Patch "GFS2: fix d_splice_alias() misuses" has been added to the 3.16-stable tree

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This is a note to let you know that I've just added the patch titled

    GFS2: fix d_splice_alias() misuses

to the 3.16-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     gfs2-fix-d_splice_alias-misuses.patch
and it can be found in the queue-3.16 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From cfb2f9d5c921e38b0f12bb26fed10b877664444d Mon Sep 17 00:00:00 2001
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Fri, 12 Sep 2014 20:56:04 +0100
Subject: GFS2: fix d_splice_alias() misuses

From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>

commit cfb2f9d5c921e38b0f12bb26fed10b877664444d upstream.

Callers of d_splice_alias(dentry, inode) don't need iput(), neither
on success nor on failure.  Either the reference to inode is stored
in a previously negative dentry, or it's dropped.  In either case
inode reference the caller used to hold is consumed.

__gfs2_lookup() does iput() in case when d_splice_alias() has failed.
Double iput() if we ever hit that.  And gfs2_create_inode() ends up
not only with double iput(), but with link count dropped to zero - on
an inode it has just found in directory.

Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Steven Whitehouse <swhiteho@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/gfs2/inode.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -626,8 +626,10 @@ static int gfs2_create_inode(struct inod
 	if (!IS_ERR(inode)) {
 		d = d_splice_alias(inode, dentry);
 		error = PTR_ERR(d);
-		if (IS_ERR(d))
+		if (IS_ERR(d)) {
+			inode = ERR_CAST(d);
 			goto fail_gunlock;
+		}
 		error = 0;
 		if (file) {
 			if (S_ISREG(inode->i_mode)) {
@@ -854,7 +856,6 @@ static struct dentry *__gfs2_lookup(stru
 
 	d = d_splice_alias(inode, dentry);
 	if (IS_ERR(d)) {
-		iput(inode);
 		gfs2_glock_dq_uninit(&gh);
 		return d;
 	}


Patches currently in stable-queue which might be from viro@xxxxxxxxxxxxxxxxxx are

queue-3.16/gfs2-fix-d_splice_alias-misuses.patch
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