netfilter: complete validation of user input

mainline inclusion
from mainline-v6.9-rc4
commit 65acf6e0501ac8880a4f73980d01b5d27648b956
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9QG86
CVE: CVE-2024-35896

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=65acf6e0501ac8880a4f73980d01b5d27648b956



---------------------------

In my recent commit, I missed that do_replace() handlers
use copy_from_sockptr() (which I fixed), followed
by unsafe copy_from_sockptr_offset() calls.

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

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

Fixes: 0c83842df40f ("netfilter: validate user input for expected length")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Pablo Neira Ayuso <pablo@netfilter.org>
Link: https://lore.kernel.org/r/20240409120741.3538135-1-edumazet@google.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Liu Jian <liujian56@huawei.com>