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 E92BFC433EF for ; Mon, 27 Dec 2021 15:34:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237853AbhL0PeW (ORCPT ); Mon, 27 Dec 2021 10:34:22 -0500 Received: from dfw.source.kernel.org ([139.178.84.217]:34766 "EHLO dfw.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237983AbhL0Pdy (ORCPT ); Mon, 27 Dec 2021 10:33:54 -0500 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 61F18610A2; Mon, 27 Dec 2021 15:33:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 46107C36AE7; Mon, 27 Dec 2021 15:33:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1640619232; bh=bUfs0Gedj1gdrIRjzY4iKOkNhyUcxve9C18EUAQv898=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Qnt7dItiYbndVA9ipiakdZ/ug3UtH8/6prrNd6BZ2/5BRCVLjMQ/rCgP9e0MJkf1q /+qms/726zGCCmOr+w06YIxqfLxK/fEwePjHuvbLv0DBD1ALs/itWKG3nQk2uZFMeg pNWyUbP9aXRVAfk7lg4enpk1INmvyvQ+WAHYAZr8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+2dc91e7fc3dea88b1e8a@syzkaller.appspotmail.com, =?UTF-8?q?R=C3=A9mi=20Denis-Courmont?= , "David S. Miller" Subject: [PATCH 4.19 38/38] phonet/pep: refuse to enable an unbound pipe Date: Mon, 27 Dec 2021 16:31:15 +0100 Message-Id: <20211227151320.658744769@linuxfoundation.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211227151319.379265346@linuxfoundation.org> References: <20211227151319.379265346@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: Rémi Denis-Courmont commit 75a2f31520095600f650597c0ac41f48b5ba0068 upstream. This ioctl() implicitly assumed that the socket was already bound to a valid local socket name, i.e. Phonet object. If the socket was not bound, two separate problems would occur: 1) We'd send an pipe enablement request with an invalid source object. 2) Later socket calls could BUG on the socket unexpectedly being connected yet not bound to a valid object. Reported-by: syzbot+2dc91e7fc3dea88b1e8a@syzkaller.appspotmail.com Signed-off-by: Rémi Denis-Courmont Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/phonet/pep.c | 2 ++ 1 file changed, 2 insertions(+) --- a/net/phonet/pep.c +++ b/net/phonet/pep.c @@ -959,6 +959,8 @@ static int pep_ioctl(struct sock *sk, in ret = -EBUSY; else if (sk->sk_state == TCP_ESTABLISHED) ret = -EISCONN; + else if (!pn->pn_sk.sobject) + ret = -EADDRNOTAVAIL; else ret = pep_sock_enable(sk, NULL, 0); release_sock(sk);