tcp: Fix use-after-free of nreq in reqsk_timer_handler().

jira VULN-8642
cve-bf CVE-2024-50154
commit-author Kuniyuki Iwashima <kuniyu@amazon.com>
commit c31e72d

The cited commit replaced inet_csk_reqsk_queue_drop_and_put() with
__inet_csk_reqsk_queue_drop() and reqsk_put() in reqsk_timer_handler().

Then, oreq should be passed to reqsk_put() instead of req; otherwise
use-after-free of nreq could happen when reqsk is migrated but the
retry attempt failed (e.g. due to timeout).

Let's pass oreq to reqsk_put().

Fixes: e8c526f ("tcp/dccp: Don't use timer_pending() in reqsk_queue_unlink().")
	Reported-by: Liu Jian <liujian56@huawei.com>
Closes: https://lore.kernel.org/netdev/1284490f-9525-42ee-b7b8-ccadf6606f6d@huawei.com/
	Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
	Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
	Reviewed-by: Liu Jian <liujian56@huawei.com>
	Reviewed-by: Eric Dumazet <edumazet@google.com>
	Reviewed-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20241123174236.62438-1-kuniyu@amazon.com
	Signed-off-by: Paolo Abeni <pabeni@redhat.com>

(cherry picked from commit c31e72d)
	Signed-off-by: Shreeya Patel <spatel@ciq.com>

Author: shreeya-patel98

net/ipv4/inet_connection_sock.c

@@ -920,7 +920,7 @@ static void reqsk_timer_handler(struct timer_list *t)
 
 drop:
 	__inet_csk_reqsk_queue_drop(sk_listener, oreq, true);
-	reqsk_put(req);
+	reqsk_put(oreq);
 }
 
 static void reqsk_queue_hash_req(struct request_sock *req,