Index: sys/dev/jedec_dimm/jedec_dimm.c
===================================================================
--- sys/dev/jedec_dimm/jedec_dimm.c
+++ sys/dev/jedec_dimm/jedec_dimm.c
@@ -192,6 +192,7 @@
 	int rc;
 	int new_desc_len;
 	enum dram_type type;
+	size_t slotid_str_size;
 	struct jedec_dimm_softc *sc;
 	struct sysctl_ctx_list *ctx;
 	struct sysctl_oid *oid;
@@ -338,13 +339,14 @@
 	}
 
 	/* If a "slotid" was hinted, add the sysctl for it. */
+	slotid_str_size = 0;
 	if (resource_string_value(device_get_name(dev), device_get_unit(dev),
 	    "slotid", &slotid_str) == 0) {
 		if (slotid_str != NULL) {
-			sc->slotid_str = malloc(strlen(slotid_str) + 1,
-			    M_DEVBUF, (M_WAITOK | M_ZERO));
-			strlcpy(sc->slotid_str, slotid_str,
-			    sizeof(sc->slotid_str));
+			slotid_str_size = strlen(slotid_str) + 1;
+			sc->slotid_str = malloc(slotid_str_size, M_DEVBUF,
+			    M_WAITOK);
+			strlcpy(sc->slotid_str, slotid_str, slotid_str_size);
 			SYSCTL_ADD_STRING(ctx, children, OID_AUTO, "slotid",
 			    CTLFLAG_RD | CTLFLAG_MPSAFE, sc->slotid_str, 0,
 			    "DIMM Slot Identifier");