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nfsd4: require version 4 when enabling or disabling minorversion

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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>
This commit is contained in:
J. Bruce Fields 2013-01-23 18:25:01 -05:00
parent bca0ec6511
commit ff89be87c7
1 changed files with 1 additions and 1 deletions
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2
fs/nfsd/nfsctl.c
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@ -534,7 +534,7 @@ static ssize_t __write_versions(struct file *file, char *buf, size_t size)
else else
num = simple_strtol(vers, &minorp, 0); num = simple_strtol(vers, &minorp, 0);
if (*minorp == '.') { if (*minorp == '.') {
if (num < 4) if (num != 4)
return -EINVAL; return -EINVAL;
minor = simple_strtoul(minorp+1, NULL, 0); minor = simple_strtoul(minorp+1, NULL, 0);
if (minor == 0) if (minor == 0)