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

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>

diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 0570391eaa165cf306d6ec4b31379acfa807b0fb..23790c7b2289d21328db2a824eef5c6484e29089 100644 (file)
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1919,7 +1919,7 @@ 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)