diff --git a/drivers/isdn/sc/interrupt.c b/drivers/isdn/sc/interrupt.c
index 485be8b1e1b3..f0225bc0f267 100644
--- a/drivers/isdn/sc/interrupt.c
+++ b/drivers/isdn/sc/interrupt.c
@@ -112,11 +112,19 @@ irqreturn_t interrupt_handler(int dummy, void *card_inst)
 			}
 			else if(callid>=0x0000 && callid<=0x7FFF)
 			{
+				int len;
+
 				pr_debug("%s: Got Incoming Call\n",
 						sc_adapter[card]->devicename);
-				strcpy(setup.phone,&(rcvmsg.msg_data.byte_array[4]));
-				strcpy(setup.eazmsn,
-					sc_adapter[card]->channel[rcvmsg.phy_link_no-1].dn);
+				len = strlcpy(setup.phone, &(rcvmsg.msg_data.byte_array[4]),
+						sizeof(setup.phone));
+				if (len >= sizeof(setup.phone))
+					continue;
+				len = strlcpy(setup.eazmsn,
+						sc_adapter[card]->channel[rcvmsg.phy_link_no - 1].dn,
+						sizeof(setup.eazmsn));
+				if (len >= sizeof(setup.eazmsn))
+					continue;
 				setup.si1 = 7;
 				setup.si2 = 0;
 				setup.plan = 0;
@@ -176,7 +184,9 @@ irqreturn_t interrupt_handler(int dummy, void *card_inst)
 		 * Handle a GetMyNumber Rsp
 		 */
 		if (IS_CE_MESSAGE(rcvmsg,Call,0,GetMyNumber)){
-			strcpy(sc_adapter[card]->channel[rcvmsg.phy_link_no-1].dn,rcvmsg.msg_data.byte_array);
+			strlcpy(sc_adapter[card]->channel[rcvmsg.phy_link_no - 1].dn,
+				rcvmsg.msg_data.byte_array,
+				sizeof(rcvmsg.msg_data.byte_array));
 			continue;
 		}