From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755012Ab2IQBEn (ORCPT ); Sun, 16 Sep 2012 21:04:43 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:33784 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754259Ab2IQAvF (ORCPT ); Sun, 16 Sep 2012 20:51:05 -0400 Message-Id: <20120917003634.835570508@decadent.org.uk> User-Agent: quilt/0.60-1 Date: Mon, 17 Sep 2012 01:37:27 +0100 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Mathias Krause , Marcel Holtmann , Gustavo Padovan , Johan Hedberg , "David S. Miller" Subject: [ 062/135] Bluetooth: RFCOMM - Fix info leak in ioctl(RFCOMMGETDEVLIST) In-Reply-To: <20120917003625.784119135@decadent.org.uk> X-SA-Exim-Connect-IP: 2001:470:1f08:1539:21c:bfff:fe03:f805 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mathias Krause [ Upstream commit f9432c5ec8b1e9a09b9b0e5569e3c73db8de432a ] The RFCOMM code fails to initialize the two padding bytes of struct rfcomm_dev_list_req inserted for alignment before copying it to userland. Additionally there are two padding bytes in each instance of struct rfcomm_dev_info. The ioctl() that for disclosures two bytes plus dev_num times two bytes uninitialized kernel heap memory. Allocate the memory using kzalloc() to fix this issue. Signed-off-by: Mathias Krause Cc: Marcel Holtmann Cc: Gustavo Padovan Cc: Johan Hedberg Signed-off-by: David S. Miller Signed-off-by: Ben Hutchings --- net/bluetooth/rfcomm/tty.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c index c258796..bc1eb56 100644 --- a/net/bluetooth/rfcomm/tty.c +++ b/net/bluetooth/rfcomm/tty.c @@ -471,7 +471,7 @@ static int rfcomm_get_dev_list(void __user *arg) size = sizeof(*dl) + dev_num * sizeof(*di); - dl = kmalloc(size, GFP_KERNEL); + dl = kzalloc(size, GFP_KERNEL); if (!dl) return -ENOMEM;