From: Weston Andros Adamson <dros@netapp.com>
Date: Wed, 1 Feb 2012 19:06:41 +0000 (-0500)
Subject: NFS: dont allow minorversion= opt when vers != 4
X-Git-Tag: firefly_0821_release~3680^2~3284^2~99
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=571b7554016941ef0f0c3c61be72561e2bc55f5e;p=firefly-linux-kernel-4.4.55.git

NFS: dont allow minorversion= opt when vers != 4

Don't allow invalid 'vers' and 'minorversion' combinations in mount options,
such as "vers=3,minorversion=1".

Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index d18a90ba165f..d05024a18984 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1531,6 +1531,9 @@ static int nfs_parse_mount_options(char *raw,
 	if (!sloppy && invalid_option)
 		return 0;
 
+	if (mnt->minorversion && mnt->version != 4)
+		goto out_minorversion_mismatch;
+
 	/*
 	 * verify that any proto=/mountproto= options match the address
 	 * familiies in the addr=/mountaddr= options.
@@ -1564,6 +1567,10 @@ out_invalid_address:
 out_invalid_value:
 	printk(KERN_INFO "NFS: bad mount option value specified: %s\n", p);
 	return 0;
+out_minorversion_mismatch:
+	printk(KERN_INFO "NFS: mount option vers=%u does not support "
+			 "minorversion=%u\n", mnt->version, mnt->minorversion);
+	return 0;
 out_nomem:
 	printk(KERN_INFO "NFS: not enough memory to parse option\n");
 	return 0;