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Commit 9b42d55a authored by Li RongQing's avatar Li RongQing Committed by David S. Miller
Browse files

tcp: release sk_frag.page in tcp_disconnect 



socket can be disconnected and gets transformed back to a listening
socket, if sk_frag.page is not released, which will be cloned into
a new socket by sk_clone_lock, but the reference count of this page
is increased, lead to a use after free or double free issue

Signed-off-by: default avatarLi RongQing <lirongqing@baidu.com>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 30e948a3

net/ipv4/tcp.c

+6 −0
Original line number Diff line number Diff line
@@ -2458,6 +2458,12 @@ int tcp_disconnect(struct sock *sk, int flags) 


	WARN_ON(inet->inet_num && !icsk->icsk_bind_hash);



	if (sk->sk_frag.page) {

		put_page(sk->sk_frag.page);

		sk->sk_frag.page = NULL;

		sk->sk_frag.offset = 0;

	}



	sk->sk_error_report(sk);

	return err;

}