[GFS2] Add NULL entry to token table

match_token() was returning garbage data instead of a fail value. This data
happened to match a valid option id for an option that required an argument (in
this case, lockproto=%s) For match_token() to correctly fail if the option
doesn't match any of the tokens, the token table must end with a NULL entry.
This patch adds the NULL entry.

Signed-off-by: Benjamin E. Marzinski <bmarzins@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/gfs2/mount.c b/fs/gfs2/mount.c
index 4864659555d4..b941f9f9f958 100644
--- a/fs/gfs2/mount.c
+++ b/fs/gfs2/mount.c
@@ -42,6 +42,7 @@ enum {
         Opt_nosuiddir,
         Opt_data_writeback,
         Opt_data_ordered,
+        Opt_err,
 };
 
 static match_table_t tokens = {
@@ -64,7 +65,8 @@ static match_table_t tokens = {
         {Opt_suiddir, "suiddir"},
         {Opt_nosuiddir, "nosuiddir"},
         {Opt_data_writeback, "data=writeback"},
-        {Opt_data_ordered, "data=ordered"}
+        {Opt_data_ordered, "data=ordered"},
+        {Opt_err, NULL}
 };
 
 /**
@@ -237,6 +239,7 @@ int gfs2_mount_args(struct gfs2_sbd *sdp, char *data_arg, int remount)
                 case Opt_data_ordered:
                         args->ar_data = GFS2_DATA_ORDERED;
                         break;
+                case Opt_err:
                 default:
                         fs_info(sdp, "unknown option: %s\n", o);
                         error = -EINVAL;