diff --git a/src/backend/commands/user.c b/src/backend/commands/user.c
index e204eb5e5d1..aed01cf4cae 100644
--- a/src/backend/commands/user.c
+++ b/src/backend/commands/user.c
@@ -2553,6 +2553,8 @@ check_createrole_self_grant(char **newval, void **extra, GucSource source)
 	list_free(elemlist);
 
 	result = (unsigned *) guc_malloc(LOG, sizeof(unsigned));
+	if (!result)
+		return false;
 	*result = options;
 	*extra = result;
 
diff --git a/src/backend/replication/slot.c b/src/backend/replication/slot.c
index 780d22afbca..a1d4768623f 100644
--- a/src/backend/replication/slot.c
+++ b/src/backend/replication/slot.c
@@ -2521,6 +2521,8 @@ check_synchronized_standby_slots(char **newval, void **extra, GucSource source)
 
 	/* GUC extra value must be guc_malloc'd, not palloc'd */
 	config = (SyncStandbySlotsConfigData *) guc_malloc(LOG, size);
+	if (!config)
+		return false;
 
 	/* Transform the data into SyncStandbySlotsConfigData */
 	config->nslotnames = list_length(elemlist);