From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Tue, 8 Sep 2009 23:50:07 +0000 (-0400)
Subject: NFSv4: Disallow 'mount -t nfs4 -overs=2' and 'mount -t nfs4 -overs=3'
X-Git-Tag: v2.6.32-rc1~716^2^2
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=2ecda72b49a0849ce41e7fa1fa974a245b9119f8

NFSv4: Disallow 'mount -t nfs4 -overs=2' and 'mount -t nfs4 -overs=3'

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 34b1ccf51adf..867f70504531 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2321,6 +2321,12 @@ static int nfs4_validate_text_mount_data(void *options,
 
 	nfs4_validate_mount_flags(args);
 
+	if (args->version != 4) {
+		dfprintk(MOUNT,
+			 "NFS4: Illegal mount version\n");
+		return -EINVAL;
+	}
+
 	if (args->auth_flavor_len > 1) {
 		dfprintk(MOUNT,
 			 "NFS4: Too many RPC auth flavours specified\n");