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fs/nfs: Fix nfs_parse_devname to not modify it's argument

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[ Upstream commit 40cc394be1aa18848b8757e03bd8ed23281f572e ]

In the rare and unsupported case of a hostname list nfs_parse_devname
will modify dev_name.  There is no need to modify dev_name as the all
that is being computed is the length of the hostname, so the computed
length can just be shorted.

Fixes: dc04589827f7 ("NFS: Use common device name parsing logic for NFSv4 and NFSv2/v3")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric W. Biederman 2019-01-30 07:58:38 -06:00 committed by Greg Kroah-Hartman
parent 00b71397e8
commit 983f90b9cc
1 changed files with 1 additions and 1 deletions
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2
fs/nfs/super.c
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@ -1901,7 +1901,7 @@ static int nfs_parse_devname(const char *dev_name,
/* kill possible hostname list: not supported */
comma = strchr(dev_name, ',');
if (comma != NULL && comma < end)
*comma = 0;
len = comma - dev_name;
}
if (len > maxnamlen)