ipv6: Fix signed integer overflow in l2tpip6sendmsg
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.4.200 by commit 2f42389d270f2304c8855b0b63498a5a4d0c053d. For more details please see the references link.