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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 15A28C3F2D1 for ; Tue, 3 Mar 2020 17:49:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E44D1214D8 for ; Tue, 3 Mar 2020 17:49:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583257797; bh=sDe29Kms8jsQ3jHa8tH7w8NuRA3O70rxNN7v9CocQ20=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=obuYxuSiTnbmy6/SwSjMj9n1rsnOTJnj82ifNh7n1l6X5BTNYfM9wj8kTs4LKTOSw ZOHFClOjDpfaqWh/ycBPU2K8h9Bf7qteyd0VwVVfRp4AuR5nPuldqd8JNZln/xqXYq A3Iwe/eba7X0a5UjEDSh+IxCL0XAZcny0BkJFgRs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731837AbgCCRtz (ORCPT ); Tue, 3 Mar 2020 12:49:55 -0500 Received: from mail.kernel.org ([198.145.29.99]:57248 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729925AbgCCRtv (ORCPT ); Tue, 3 Mar 2020 12:49:51 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1573F2146E; Tue, 3 Mar 2020 17:49:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583257791; bh=sDe29Kms8jsQ3jHa8tH7w8NuRA3O70rxNN7v9CocQ20=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vcYkxkCbOqtZyVe/gu8ZdfV+omy8+p2zJfchG9as1a7XTf+wVziynxgYhJDB1uW0G sWjKi51bJMaQ43Q6Hl0UwOUh4pVTfBgsTa8nrrXm+gv6JOzKuh276GAgBLMlhwc8RF IhnlrOIoZDhI+LW80Lac57vB63qxM1+4FBcab6+s= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+4b1fe8105f8044a26162@syzkaller.appspotmail.com, Ursula Braun , Karsten Graul , "David S. Miller" Subject: [PATCH 5.5 103/176] net/smc: transfer fasync_list in case of fallback Date: Tue, 3 Mar 2020 18:42:47 +0100 Message-Id: <20200303174316.760064048@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200303174304.593872177@linuxfoundation.org> References: <20200303174304.593872177@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ursula Braun commit 67f562e3e147750a02b2a91d21a163fc44a1d13e upstream. SMC does not work together with FASTOPEN. If sendmsg() is called with flag MSG_FASTOPEN in SMC_INIT state, the SMC-socket switches to fallback mode. To handle the previous ioctl FIOASYNC call correctly in this case, it is necessary to transfer the socket wait queue fasync_list to the internal TCP socket. Reported-by: syzbot+4b1fe8105f8044a26162@syzkaller.appspotmail.com Fixes: ee9dfbef02d18 ("net/smc: handle sockopts forcing fallback") Signed-off-by: Ursula Braun Signed-off-by: Karsten Graul Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/smc/af_smc.c | 2 ++ 1 file changed, 2 insertions(+) --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -470,6 +470,8 @@ static void smc_switch_to_fallback(struc if (smc->sk.sk_socket && smc->sk.sk_socket->file) { smc->clcsock->file = smc->sk.sk_socket->file; smc->clcsock->file->private_data = smc->clcsock; + smc->clcsock->wq.fasync_list = + smc->sk.sk_socket->wq.fasync_list; } }