From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4EB5963B8 for ; Mon, 20 Feb 2023 13:47:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CA1D4C433D2; Mon, 20 Feb 2023 13:47:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1676900859; bh=T1kifxKCcz36WRe+I26DJfv71M1mq8/SHh41hZWGDKQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WCMxgu7UmhR+rHN/6NEGyAlMOvckLcctd0Qd2nhbTGdQS264D/ItBNwD0Pg6VDQjV +1Z/s7hfpYoRNFYn188KfmSJzUQ3M60T2dAS8nxv7cJgSakIAaUGJQSYEhQMxLodAm IrhIe8C9oR3Qpavf/ZV3uFTQZeN401rlK7yycSaM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Hyunwoo Kim , Kuniyuki Iwashima , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.4 094/156] net/rose: Fix to not accept on connected socket Date: Mon, 20 Feb 2023 14:35:38 +0100 Message-Id: <20230220133606.378110760@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230220133602.515342638@linuxfoundation.org> References: <20230220133602.515342638@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Hyunwoo Kim [ Upstream commit 14caefcf9837a2be765a566005ad82cd0d2a429f ] If you call listen() and accept() on an already connect()ed rose socket, accept() can successfully connect. This is because when the peer socket sends data to sendmsg, the skb with its own sk stored in the connected socket's sk->sk_receive_queue is connected, and rose_accept() dequeues the skb waiting in the sk->sk_receive_queue. This creates a child socket with the sk of the parent rose socket, which can cause confusion. Fix rose_listen() to return -EINVAL if the socket has already been successfully connected, and add lock_sock to prevent this issue. Signed-off-by: Hyunwoo Kim Reviewed-by: Kuniyuki Iwashima Link: https://lore.kernel.org/r/20230125105944.GA133314@ubuntu Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/rose/af_rose.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c index 95dda29058a0e..6fb158172ddc2 100644 --- a/net/rose/af_rose.c +++ b/net/rose/af_rose.c @@ -465,6 +465,12 @@ static int rose_listen(struct socket *sock, int backlog) { struct sock *sk = sock->sk; + lock_sock(sk); + if (sock->state != SS_UNCONNECTED) { + release_sock(sk); + return -EINVAL; + } + if (sk->sk_state != TCP_LISTEN) { struct rose_sock *rose = rose_sk(sk); @@ -474,8 +480,10 @@ static int rose_listen(struct socket *sock, int backlog) memset(rose->dest_digis, 0, AX25_ADDR_LEN * ROSE_MAX_DIGIS); sk->sk_max_ack_backlog = backlog; sk->sk_state = TCP_LISTEN; + release_sock(sk); return 0; } + release_sock(sk); return -EOPNOTSUPP; } -- 2.39.0