CVE-2024-35962

In the Linux kernel, the following vulnerability has been resolved:

netfilter: complete validation of user input

In my recent commit, I missed that doreplace() handlers use copyfromsockptr() (which I fixed), followed by unsafe copyfromsockptroffset() calls.

In all functions, we can perform the @optlen validation before even calling xtalloctable_info() with the following check:

if ((u64)optlen < (u64)tmp.size + sizeof(tmp)) return -EINVAL;