From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B9836C433F5 for ; Mon, 21 Feb 2022 09:07:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244522AbiBUJHa (ORCPT ); Mon, 21 Feb 2022 04:07:30 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:32962 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347751AbiBUJBo (ORCPT ); Mon, 21 Feb 2022 04:01:44 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 24A4E28E39; Mon, 21 Feb 2022 00:57:03 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0581661133; Mon, 21 Feb 2022 08:57:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D4F79C340EB; Mon, 21 Feb 2022 08:57:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1645433822; bh=08h2yCgKCIY4hiAo9WbG4jL5EN1GuuYoPh/QspWaDig=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=g352cpm0xv/DHxiNFynXX68aV57+sERiGJPGZOX53PUwUPk+C63scwBSpKLt15HHy MQ/B4EKaucUS/oT/OpO9Eiu++vGsQ6C+vzAaGX0WZ53S1yiUSWMz5vlH4DNyxqvG6G 9pCsNI7O3o6T7ZCxh1cSgjXwp66yxqRALtH0Vo5M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Seth Forshee , Stefano Garzarella , Jakub Kicinski Subject: [PATCH 4.19 22/58] vsock: remove vsock from connected table when connect is interrupted by a signal Date: Mon, 21 Feb 2022 09:49:15 +0100 Message-Id: <20220221084912.601395626@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220221084911.895146879@linuxfoundation.org> References: <20220221084911.895146879@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Seth Forshee commit b9208492fcaecff8f43915529ae34b3bcb03877c upstream. vsock_connect() expects that the socket could already be in the TCP_ESTABLISHED state when the connecting task wakes up with a signal pending. If this happens the socket will be in the connected table, and it is not removed when the socket state is reset. In this situation it's common for the process to retry connect(), and if the connection is successful the socket will be added to the connected table a second time, corrupting the list. Prevent this by calling vsock_remove_connected() if a signal is received while waiting for a connection. This is harmless if the socket is not in the connected table, and if it is in the table then removing it will prevent list corruption from a double add. Note for backporting: this patch requires d5afa82c977e ("vsock: correct removal of socket from the list"), which is in all current stable trees except 4.9.y. Fixes: d021c344051a ("VSOCK: Introduce VM Sockets") Signed-off-by: Seth Forshee Reviewed-by: Stefano Garzarella Link: https://lore.kernel.org/r/20220217141312.2297547-1-sforshee@digitalocean.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- net/vmw_vsock/af_vsock.c | 1 + 1 file changed, 1 insertion(+) --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -1230,6 +1230,7 @@ static int vsock_stream_connect(struct s sk->sk_state = sk->sk_state == TCP_ESTABLISHED ? TCP_CLOSING : TCP_CLOSE; sock->state = SS_UNCONNECTED; vsock_transport_cancel_pkt(vsk); + vsock_remove_connected(vsk); goto out_wait; } else if (timeout == 0) { err = -ETIMEDOUT;