CVE-2023-54318 net/smc: use smc_lgr_list.lock to protect smc_lgr_list.list iterate in smcr_port_add

In the Linux kernel, the following vulnerability has been resolved: net/smc: use smclgrlist.lock to protect smclgrlist.list iterate in smcrportadd While doing smcrportadd, there maybe linkgroup add into or delete from smclgrlist.list at the same time, which may result kernel crash. So, use...