CVE-2022-49865 ipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network

In the Linux kernel, the following vulnerability has been resolved: ipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network When copying a struct ifaddrlblmsg to the network, ifalreserved remained uninitialized, resulting in a 1-byte infoleak: BUG: KMSAN: kernel-network-infoleak...