linux-kernel - [PATCH 3.13 045/120] nfs4: fix discover_server

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Date:	Tue, 11 Feb 2014 11:04:46 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Weston Andros Adamson <dros@...marydata.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>
Subject: [PATCH 3.13 045/120] nfs4: fix discover_server_trunking use after free

3.13-stable review patch.  If anyone has any objections, please let me know.

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

From: Weston Andros Adamson <dros@...marydata.com>

commit abad2fa5ba67725a3f9c376c8cfe76fbe94a3041 upstream.

If clp is new (cl_count = 1) and it matches another client in
nfs4_discover_server_trunking, the nfs_put_client will free clp before
->cl_preserve_clid is set.

Signed-off-by: Weston Andros Adamson <dros@...marydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfs/nfs4client.c |   10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -409,13 +409,11 @@ struct nfs_client *nfs4_init_client(stru
 	error = nfs4_discover_server_trunking(clp, &old);
 	if (error < 0)
 		goto error;
-	nfs_put_client(clp);
-	if (clp != old) {
-		clp->cl_preserve_clid = true;
-		clp = old;
-	}
 
-	return clp;
+	if (clp != old)
+		clp->cl_preserve_clid = true;
+	nfs_put_client(clp);
+	return old;
 
 error:
 	nfs_mark_client_ready(clp, error);


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