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122 lines
4.8 KiB
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From: =?ISO-8859-1?Q?Nicolas_de_Peslo=FCan?=
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<nicolas.2p.debian@gmail.com>
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Subject: Re: [PATCH] core: dev: don't call BUG() on bad input
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Date: Mon, 14 Feb 2011 13:16:04 +0100
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Lines: 54
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Message-ID: <4D591D04.4050000@gmail.com>
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References: <1297680967-11893-1-git-send-email-segoon@openwall.com>
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Mime-Version: 1.0
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format=flowed
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Content-Transfer-Encoding: QUOTED-PRINTABLE
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Cc: linux-kernel@vger.kernel.org,
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"David S. Miller" <davem@davemloft.net>,
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Eric Dumazet <eric.dumazet@gmail.com>,
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Tom Herbert <therbert@google.com>,
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Changli Gao <xiaosuo@gmail.com>,
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Jesse Gross <jesse@nicira.com>, netdev@vger.kernel.org
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To: Vasiliy Kulikov <segoon@openwall.com>
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X-From: netdev-owner@vger.kernel.org Mon Feb 14 13:16:23 2011
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Return-path: <netdev-owner@vger.kernel.org>
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Envelope-to: linux-netdev-2@lo.gmane.org
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Received: from vger.kernel.org ([209.132.180.67])
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by lo.gmane.org with esmtp (Exim 4.69)
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(envelope-from <netdev-owner@vger.kernel.org>)
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id 1PoxLn-0007s8-Rx
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for linux-netdev-2@lo.gmane.org; Mon, 14 Feb 2011 13:16:20 +0100
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<rfc822;linux-netdev-2@m.gmane.org>); Mon, 14 Feb 2011 07:16:16 -0500
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Received: from [192.168.0.101] (eab95-4-88-175-177-37.fbx.proxad.net [88.175.177.37])
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by mx.google.com with ESMTPS id a17sm1733557bku.23.2011.02.14.04.16.07
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(version=SSLv3 cipher=OTHER);
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Mon, 14 Feb 2011 04:16:09 -0800 (PST)
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User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.16) Gecko/20101226 Icedove/3.0.11
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In-Reply-To: <1297680967-11893-1-git-send-email-segoon@openwall.com>
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Sender: netdev-owner@vger.kernel.org
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Precedence: bulk
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List-ID: <netdev.vger.kernel.org>
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X-Mailing-List: netdev@vger.kernel.org
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1099697>
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Le 14/02/2011 11:56, Vasiliy Kulikov a =E9crit :
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> alloc_netdev() may be called with too long name (more that IFNAMSIZ b=
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ytes).
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> Currently this leads to BUG(). Other insane inputs (bad txqs, rxqs) =
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and
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> even OOM don't lead to BUG(). Made alloc_netdev() return NULL, like =
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on
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> other errors.
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>
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> Signed-off-by: Vasiliy Kulikov<segoon@openwall.com>
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> ---
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> Compile tested.
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>
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> net/core/dev.c | 5 ++++-
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> 1 files changed, 4 insertions(+), 1 deletions(-)
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>
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> diff --git a/net/core/dev.c b/net/core/dev.c
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> index 6392ea0..12ef4b0 100644
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> --- a/net/core/dev.c
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> +++ b/net/core/dev.c
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> @@ -5761,7 +5761,10 @@ struct net_device *alloc_netdev_mqs(int sizeof=
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_priv, const char *name,
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> size_t alloc_size;
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> struct net_device *p;
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>
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> - BUG_ON(strlen(name)>=3D sizeof(dev->name));
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> + if (strnlen(name, sizeof(dev->name))>=3D sizeof(dev->name)) {
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"size_t strnlen(const char *s, size_t maxlen) : The strnlen() function =
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returns strlen(s), if that is=20
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less than maxlen, or maxlen if there is no '\0' character among the fir=
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st maxlen characters pointed=20
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to by s."
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How can strnlen(name, sizeof(dev->name)) be greater than sizeof(dev->na=
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me)?
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Shouldn't it be "if (strnlen(name, sizeof(dev->name)) =3D=3D sizeof(dev=
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->name))" instead?
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Nicolas.
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> + pr_err("alloc_netdev: Too long device name \n");
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> + return NULL;
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> + }
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>
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> if (txqs< 1) {
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> pr_err("alloc_netdev: Unable to allocate device "
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--
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