cmap: Handle NULL params in few more functions

Signed-off-by: Jan Friesse <jfriesse@redhat.com>
Reviewed-by: Fabio M. Di Nitto <fdinitto@redhat.com>
(cherry picked from commit 11f4c1141d9257375d8bb14a543802ccc5ab5836)

lib/cmap.c

@@ -789,6 +789,10 @@ cs_error_t cmap_iter_init(
 	struct req_lib_cmap_iter_init req_lib_cmap_iter_init;
 	struct res_lib_cmap_iter_init res_lib_cmap_iter_init;
 
+	if (cmap_iter_handle == NULL) {
+		return (CS_ERR_INVALID_PARAM);
+	}
+
 	error = hdb_error_to_cs(hdb_handle_get (&cmap_handle_t_db, handle, (void *)&cmap_inst));
 	if (error != CS_OK) {
 		return (error);
@@ -842,6 +846,10 @@ cs_error_t cmap_iter_next(
 	struct req_lib_cmap_iter_next req_lib_cmap_iter_next;
 	struct res_lib_cmap_iter_next res_lib_cmap_iter_next;
 
+	if (key_name == NULL) {
+		return (CS_ERR_INVALID_PARAM);
+	}
+
 	error = hdb_error_to_cs(hdb_handle_get (&cmap_handle_t_db, handle, (void *)&cmap_inst));
 	if (error != CS_OK) {
 		return (error);
@@ -938,6 +946,10 @@ cs_error_t cmap_track_add(
 	struct cmap_track_inst *cmap_track_inst;
 	cmap_track_handle_t cmap_track_inst_handle;
 
+	if (cmap_track_handle == NULL || notify_fn == NULL) {
+		return (CS_ERR_INVALID_PARAM);
+	}
+
 	error = hdb_error_to_cs(hdb_handle_get (&cmap_handle_t_db, handle, (void *)&cmap_inst));
 	if (error != CS_OK) {
 		return (error);