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 <[e-mail]>
Signed-off-by: Patrick McHardy <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

lib/ts_fsm.c

···
 }
 
 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;
···
 	size_t priv_size = sizeof(*fsm) + len;
 
 	if (len  % sizeof(struct ts_fsm_token) || ntokens < 1)
+		goto errout;
+
+	if (flags & TS_IGNORECASE)
 		goto errout;
 
 	for (i = 0; i < ntokens; i++) {
···
 	if (IS_ERR(conf))
 		return conf;
 
+	conf->flags = flags;
 	fsm = ts_config_priv(conf);
 	fsm->ntokens = ntokens;
 	memcpy(fsm->tokens, pattern, len);