[IPV4]: ipconfig should use memmove() instead of strcpy()

strcpy is undefined if src and dest overlap.  That's clearly possible
here with a sufficiently deep path on the server.  Use memmove instead.
Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/ipconfig.c

@@ -1232,7 +1232,7 @@ u32 __init root_nfs_parse_addr(char *name)
 		if (*cp == ':')
 			*cp++ = '\0';
 		addr = in_aton(name);
-		strcpy(name, cp);
+		memmove(name, cp, strlen(cp) + 1);
 	} else
 		addr = INADDR_NONE;