[ 3.5.y.z extended stable ] Patch "NFS: Fix error reporting in nfs_xdev_mount" has been added to staging queue

[Herton Ronaldo Krzesinski]

This is a note to let you know that I have just added a patch titled

    NFS: Fix error reporting in nfs_xdev_mount

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

>From 4783f233bc3967921268976295dcabd257ed9c55 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <Trond.Myklebust at netapp.com>
Date: Wed, 16 Jan 2013 15:05:44 -0500
Subject: [PATCH] NFS: Fix error reporting in nfs_xdev_mount

commit dee972b967ae111ad5705733de17a3bfc4632311 upstream.

Currently, nfs_xdev_mount converts all errors from clone_server() to
ENOMEM, which can then leak to userspace (for instance to 'mount'). Fix that.
Also ensure that if nfs_fs_mount_common() returns an error, we
don't dprintk(0)...

The regression originated in commit 3d176e3fe4f6dc379b252bf43e2e146a8f7caf01
(NFS: Use nfs_fs_mount_common() for xdev mounts)

Signed-off-by: Trond Myklebust <Trond.Myklebust at netapp.com>
[ herton: backport for 3.5:
  * don't change dprintk to print nfs_xdev_mount as we are still in
    nfs_xdev_mount_common
  * differing clone_server/nfs_fs_mount_common (function call and
    arguments), keep the same calls as in 3.5 ]
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
 fs/nfs/super.c |   19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 2292f7e..f3cc9b6 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2541,7 +2541,6 @@ nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,
 	struct nfs_clone_mount *data = mount_info->cloned;
 	struct nfs_server *server;
 	struct dentry *mntroot = ERR_PTR(-ENOMEM);
-	int error;

 	dprintk("--> nfs_xdev_mount_common()\n");

@@ -2549,19 +2548,15 @@ nfs_xdev_mount_common(struct file_system_type *fs_type, int flags,

 	/* create a new volume representation */
 	server = nfs_clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
-	if (IS_ERR(server)) {
-		error = PTR_ERR(server);
-		goto out_err;
-	}
+	if (IS_ERR(server))
+		mntroot = ERR_CAST(server);
+	else
+		mntroot = nfs_fs_mount_common(fs_type, server, flags,
+				dev_name, mount_info);

-	mntroot = nfs_fs_mount_common(fs_type, server, flags, dev_name, mount_info);
-	dprintk("<-- nfs_xdev_mount_common() = 0\n");
-out:
+	dprintk("<-- nfs_xdev_mount_common() = %ld\n",
+			IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
 	return mntroot;
-
-out_err:
-	dprintk("<-- nfs_xdev_mount_common() = %d [error]\n", error);
-	goto out;
 }

 /*
--
1.7.9.5