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 72250C433F5 for ; Tue, 5 Apr 2022 09:52:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243124AbiDEJjC (ORCPT ); Tue, 5 Apr 2022 05:39:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41476 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244112AbiDEJJq (ORCPT ); Tue, 5 Apr 2022 05:09:46 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D73E318377; Tue, 5 Apr 2022 01:59:10 -0700 (PDT) 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 ams.source.kernel.org (Postfix) with ESMTPS id 5D953B81BAE; Tue, 5 Apr 2022 08:59:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BA711C385A3; Tue, 5 Apr 2022 08:59:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649149147; bh=sFS7G5rZj3C0ZMjUhhbET/vBcgSalnDjkfieF0x48Fg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mCTfE9IoUAhinV75Vll4X4HYP3ZayopUiTfMmff5bF7ekv/UGZMjeH3TyJaXNcO2q Z7AI57G5ha+Pk7RmBGKjjYQ6sL6Svy7GOpRFNcHtrACNn27kUP6E2pctf7rJihgl09 c1zXt+AXqlx+toTPJpFAPmHtCbR57bQOEkDjNEwc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Derek Will , Oliver Hartkopp , Marc Kleine-Budde , Sasha Levin Subject: [PATCH 5.16 0611/1017] can: isotp: return -EADDRNOTAVAIL when reading from unbound socket Date: Tue, 5 Apr 2022 09:25:24 +0200 Message-Id: <20220405070412.417635334@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405070354.155796697@linuxfoundation.org> References: <20220405070354.155796697@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: stable@vger.kernel.org From: Oliver Hartkopp [ Upstream commit 30ffd5332e06316bd69a654c06aa033872979b7c ] When reading from an unbound can-isotp socket the syscall blocked indefinitely. As unbound sockets (without given CAN address information) do not make sense anyway we directly return -EADDRNOTAVAIL on read() analogue to the known behavior from sendmsg(). Fixes: e057dd3fc20f ("can: add ISO 15765-2:2016 transport protocol") Link: https://github.com/linux-can/can-utils/issues/349 Link: https://lore.kernel.org/all/20220316164258.54155-2-socketcan@hartkopp.net Suggested-by: Derek Will Signed-off-by: Oliver Hartkopp Signed-off-by: Marc Kleine-Budde Signed-off-by: Sasha Levin --- net/can/isotp.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/can/isotp.c b/net/can/isotp.c index f8e3aeb79e3f..8966f06e0660 100644 --- a/net/can/isotp.c +++ b/net/can/isotp.c @@ -1005,12 +1005,16 @@ static int isotp_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, { struct sock *sk = sock->sk; struct sk_buff *skb; + struct isotp_sock *so = isotp_sk(sk); int err = 0; int noblock; noblock = flags & MSG_DONTWAIT; flags &= ~MSG_DONTWAIT; + if (!so->bound) + return -EADDRNOTAVAIL; + skb = skb_recv_datagram(sk, flags, noblock, &err); if (!skb) return err; -- 2.34.1