From: J. Bruce Fields <bfields@redhat.com>
Date: Wed, 23 Jan 2013 23:25:01 +0000 (-0500)
Subject: nfsd4: require version 4 when enabling or disabling minorversion
X-Git-Tag: v3.9-rc1~40^2~41
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ff89be87c70247ffe3a72271e02eb7765cdd12c4;p=platform%2Fupstream%2Fkernel-adaptation-pc.git

nfsd4: require version 4 when enabling or disabling minorversion

The current code will allow silly things like:

	echo "+2 +3 +4 +7.1">/proc/fs/nfsd/versions

Reported-by: Fan Chaoting <fanchaoting@cn.fujitsu.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
---

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 7493428..65889ec 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -534,7 +534,7 @@ static ssize_t __write_versions(struct file *file, char *buf, size_t size)
 			else
 				num = simple_strtol(vers, &minorp, 0);
 			if (*minorp == '.') {
-				if (num < 4)
+				if (num != 4)
 					return -EINVAL;
 				minor = simple_strtoul(minorp+1, NULL, 0);
 				if (minor == 0)