diff --git a/sys/geom/gate/g_gate.c b/sys/geom/gate/g_gate.c
--- a/sys/geom/gate/g_gate.c
+++ b/sys/geom/gate/g_gate.c
@@ -467,7 +467,8 @@
 	struct g_geom *gp;
 	struct g_provider *pp, *ropp;
 	struct g_consumer *cp;
-	char name[NAME_MAX];
+	char name[NAME_MAX + 1];
+	char readprov[NAME_MAX + 1];
 	int error = 0, unit;
 
 	if (ggio->gctl_mediasize <= 0) {
@@ -522,9 +523,10 @@
 	sc->sc_unit = g_gate_getunit(ggio->gctl_unit, &error);
 	if (sc->sc_unit < 0)
 		goto fail1;
-	if (ggio->gctl_unit == G_GATE_NAME_GIVEN)
-		snprintf(name, sizeof(name), "%s", ggio->gctl_name);
-	else {
+	if (ggio->gctl_unit == G_GATE_NAME_GIVEN) {
+		memset(name, 0, sizeof(name));
+		strncpy(name, ggio->gctl_name, MIN(sizeof(name) - 1, sizeof(ggio->gctl_name)));
+	} else {
 		snprintf(name, sizeof(name), "%s%d", G_GATE_PROVIDER_NAME,
 		    sc->sc_unit);
 	}
@@ -547,10 +549,11 @@
 	if (ggio->gctl_readprov[0] == '\0') {
 		ropp = NULL;
 	} else {
-		ropp = g_provider_by_name(ggio->gctl_readprov);
+		memset(readprov, 0, sizeof(readprov));
+		strncpy(readprov, ggio->gctl_readprov, MIN(sizeof(readprov) - 1, sizeof(ggio->gctl_readprov)));
+		ropp = g_provider_by_name(readprov);
 		if (ropp == NULL) {
-			G_GATE_DEBUG(1, "Provider %s doesn't exist.",
-			    ggio->gctl_readprov);
+			G_GATE_DEBUG(1, "Provider %s doesn't exist.", readprov);
 			error = EINVAL;
 			goto fail2;
 		}
@@ -632,6 +635,7 @@
 static int
 g_gate_modify(struct g_gate_softc *sc, struct g_gate_ctl_modify *ggio)
 {
+	char readprov[NAME_MAX + 1];
 	struct g_provider *pp;
 	struct g_consumer *cp;
 	int done, error;
@@ -667,11 +671,12 @@
 		} else
 			mtx_unlock(&sc->sc_read_mtx);
 		if (ggio->gctl_readprov[0] != '\0') {
-			pp = g_provider_by_name(ggio->gctl_readprov);
+			memset(readprov, 0, sizeof(readprov));
+			strncpy(readprov, ggio->gctl_readprov, MIN(sizeof(readprov) - 1, sizeof(ggio->gctl_readprov)));
+			pp = g_provider_by_name(readprov);
 			if (pp == NULL) {
 				g_topology_unlock();
-				G_GATE_DEBUG(1, "Provider %s doesn't exist.",
-				    ggio->gctl_readprov);
+				G_GATE_DEBUG(1, "Provider %s doesn't exist.", readprov);
 				return (EINVAL);
 			}
 			cp = g_new_consumer(sc->sc_provider->geom);