[CIFS] potential NULL dereference in parse_DFS_referrals()

memory allocation may fail, prevent a NULL dereference

Pointed out by Roel Kluin

CC: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: NSteve French <sfrench@us.ibm.com>

fs/cifs/cifssmb.c

@@ -3961,6 +3961,10 @@ parse_DFS_referrals(TRANSACTION2_GET_DFS_REFER_RSP *pSMBr,
 		if (is_unicode) {
 			__le16 *tmp = kmalloc(strlen(searchName)*2 + 2,
 						GFP_KERNEL);
+			if (tmp == NULL) {
+				rc = -ENOMEM;
+				goto parse_DFS_referrals_exit;
+			}
 			cifsConvertToUCS((__le16 *) tmp, searchName,
 					PATH_MAX, nls_codepage, remap);
 			node->path_consumed = cifs_ucs2_bytes(tmp,