lib: rpmsg: Fix safe_strcpy call

Fix the size of the source string passed in argument of safe_strcpy().
In rpmsg_register_endpoint we can not trust the size of the name
string provided, so we limit the max size to RPMSG_NAME_SIZE.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>

lib/rpmsg/rpmsg.c

@@ -142,7 +142,7 @@ int rpmsg_send_ns_message(struct rpmsg_endpoint *ept, unsigned long flags)
 
 	ns_msg.flags = flags;
 	ns_msg.addr = ept->addr;
-	(void)safe_strcpy(ns_msg.name, sizeof(ns_msg.name), ept->name, strlen(ept->name));
+	(void)safe_strcpy(ns_msg.name, sizeof(ns_msg.name), ept->name, sizeof(ept->name));
 	ret = rpmsg_send_offchannel_raw(ept, ept->addr,
 					RPMSG_NS_EPT_ADDR,
 					&ns_msg, sizeof(ns_msg), true);
@@ -307,7 +307,8 @@ void rpmsg_register_endpoint(struct rpmsg_device *rdev,
 			     rpmsg_ns_unbind_cb ns_unbind_cb, void *priv)
 {
 	if (name)
-		(void)safe_strcpy(ept->name, sizeof(ept->name), name, sizeof(name));
+		(void)safe_strcpy(ept->name, sizeof(ept->name), name,
+				  strnlen(name, RPMSG_NAME_SIZE));
 	else
 		ept->name[0] = 0;