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 7D56CC433EF for ; Mon, 27 Dec 2021 19:07:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233358AbhL0THI (ORCPT ); Mon, 27 Dec 2021 14:07:08 -0500 Received: from dfw.source.kernel.org ([139.178.84.217]:41464 "EHLO dfw.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232818AbhL0TGI (ORCPT ); Mon, 27 Dec 2021 14:06:08 -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 36DAC61129; Mon, 27 Dec 2021 19:06:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B9389C36AEF; Mon, 27 Dec 2021 19:06:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1640631967; bh=P2aloyVRRLtjI1NPhp7tnh3pRXJVs2w63B6dDaYTML4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GpNH6LOJjjILW4w71IFYy3b9+q4g8bQY4JXJXRJUvGkA1P7Uev29BGSEdkt+JvQkT n+Bv63K7cIIxfKxLT9W0I7roTIvsoglWF8zOt7eEIEHHeB7MxABxif+oSMj62PGsAV V8VAYvuUlm1qA69cDefE9gw0cyAaswJCBPBy5AcPYF+hPJYjmwHbAZ5yar2xoiwc0z ILqzSW+9swZe++UP11IjfffLFt3k3rptrzVs9vyne9Qs/eVWUf7T7Vag+HYB/Xi7lf WzQctDCKERba6FzVDzOWENMrBWQOeC0JoJNPnUxg58a4gM/+bqsjgeTEYTTNu4PmYu akkyeRjzkjt7w== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: =?UTF-8?q?R=C3=A9mi=20Denis-Courmont?= , syzbot+2dc91e7fc3dea88b1e8a@syzkaller.appspotmail.com, "David S . Miller" , Sasha Levin , courmisch@gmail.com, kuba@kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 7/9] phonet/pep: refuse to enable an unbound pipe Date: Mon, 27 Dec 2021 14:05:34 -0500 Message-Id: <20211227190536.1042975-7-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211227190536.1042975-1-sashal@kernel.org> References: <20211227190536.1042975-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rémi Denis-Courmont [ Upstream commit 75a2f31520095600f650597c0ac41f48b5ba0068 ] 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: Sasha Levin --- net/phonet/pep.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/phonet/pep.c b/net/phonet/pep.c index 4577e43cb7778..a07e13f63332c 100644 --- a/net/phonet/pep.c +++ b/net/phonet/pep.c @@ -946,6 +946,8 @@ static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg) 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); -- 2.34.1