net: tls, update curr on splice as well

JIRA: https://issues.redhat.com/browse/RHEL-19066
CVE: CVE-2024-0646
Tested: selftests + reproducer

Conflict: apply the changes to tls_sw_do_sendpage, missing the big
  splice rework (fe1e81d and 45e5be8)

commit c5a5950
Author: John Fastabend <[email protected]>
Date:   Wed Dec 6 15:27:05 2023 -0800

    net: tls, update curr on splice as well

    The curr pointer must also be updated on the splice similar to how
    we do this for other copy types.

    Fixes: d829e9c ("tls: convert to generic sk_msg interface")
    Signed-off-by: John Fastabend <[email protected]>
    Reported-by: Jann Horn <[email protected]>
    Link: https://lore.kernel.org/r/[email protected]
    Signed-off-by: Jakub Kicinski <[email protected]>

Signed-off-by: Sabrina Dubroca <[email protected]>

Author: Sabrina Dubroca

net/tls/tls_sw.c

@@ -1213,6 +1213,8 @@ static int tls_sw_do_sendpage(struct sock *sk, struct page *page,
 		}
 
 		sk_msg_page_add(msg_pl, page, copy, offset);
+		msg_pl->sg.copybreak = 0;
+		msg_pl->sg.curr = msg_pl->sg.end;
 		sk_mem_charge(sk, copy);
 
 		offset += copy;