textsearch: ts_fsm: return error on request for case insensitive search

For fsm text search, handle case insensitive parameter as -EINVAL.
Signed-off-by: Joonwoo Park <joonwpark81@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

lib/ts_fsm.c

@@ -257,7 +257,7 @@ static unsigned int fsm_find(struct ts_config *conf, struct ts_state *state)
 }
 
 static struct ts_config *fsm_init(const void *pattern, unsigned int len,
-				     gfp_t gfp_mask)
+				    gfp_t gfp_mask, int flags)
 {
 	int i, err = -EINVAL;
 	struct ts_config *conf;
@@ -269,6 +269,9 @@ static struct ts_config *fsm_init(const void *pattern, unsigned int len,
 	if (len  % sizeof(struct ts_fsm_token) || ntokens < 1)
 		goto errout;
 
+	if (flags & TS_IGNORECASE)
+		goto errout;
+
 	for (i = 0; i < ntokens; i++) {
 		struct ts_fsm_token *t = &tokens[i];
 
@@ -284,6 +287,7 @@ static struct ts_config *fsm_init(const void *pattern, unsigned int len,
 	if (IS_ERR(conf))
 		return conf;
 
+	conf->flags = flags;
 	fsm = ts_config_priv(conf);
 	fsm->ntokens = ntokens;
 	memcpy(fsm->tokens, pattern, len);