From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:50318 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726241AbeIXRjN (ORCPT ); Mon, 24 Sep 2018 13:39:13 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , Tyler Hicks , Seth Arnold , Stefan Bader Subject: [PATCH 3.18 028/105] irda: Fix memory leak caused by repeated binds of irda socket Date: Mon, 24 Sep 2018 13:33:14 +0200 Message-Id: <20180924113116.566418010@linuxfoundation.org> In-Reply-To: <20180924113113.268650190@linuxfoundation.org> References: <20180924113113.268650190@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tyler Hicks The irda_bind() function allocates memory for self->ias_obj without checking to see if the socket is already bound. A userspace process could repeatedly bind the socket, have each new object added into the LM-IAS database, and lose the reference to the old object assigned to the socket to exhaust memory resources. This patch errors out of the bind operation when self->ias_obj is already assigned. CVE-2018-6554 Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Tyler Hicks Reviewed-by: Seth Arnold Reviewed-by: Stefan Bader Signed-off-by: Greg Kroah-Hartman --- net/irda/af_irda.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/net/irda/af_irda.c +++ b/net/irda/af_irda.c @@ -785,6 +785,13 @@ static int irda_bind(struct socket *sock return -EINVAL; lock_sock(sk); + + /* Ensure that the socket is not already bound */ + if (self->ias_obj) { + err = -EINVAL; + goto out; + } + #ifdef CONFIG_IRDA_ULTRA /* Special care for Ultra sockets */ if ((sk->sk_type == SOCK_DGRAM) &&