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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 14:01:44 +0100
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Lines: 40
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Message-ID: <4D5927B8.2070704@gmail.com>
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References: <1297680967-11893-1-git-send-email-segoon@openwall.com> <4D591D04.4050000@gmail.com> <20110214122313.GA10062@albatros>
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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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In-Reply-To: <20110214122313.GA10062@albatros>
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Sender: netdev-owner@vger.kernel.org
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1099723>
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Le 14/02/2011 13:23, Vasiliy Kulikov a =E9crit :
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> Hi Nicolas,
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Hi Vasiliy,
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> On Mon, Feb 14, 2011 at 13:16 +0100, Nicolas de Peslo=FCan wrote:
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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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>
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> Ehh... Space after ")" is needed :)
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:-D
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>> "size_t strnlen(const char *s, size_t maxlen) : The strnlen()
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>> function returns strlen(s), if that is less than maxlen, or maxlen
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>> if there is no '\0' character among the first maxlen characters
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>> pointed to by s."
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>>
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>> How can strnlen(name, sizeof(dev->name)) be greater than sizeof(dev-=
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>name)?
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>>
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>> Shouldn't it be "if (strnlen(name, sizeof(dev->name)) =3D=3D sizeof(=
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dev->name))" instead?
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>
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> Not a big deal, but MO it's better to guard from everything that
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> is not a good input by negating the check. strnlen()< sizeof() is O=
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K,
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> strnlen()>=3D sizeof() is bad. Is "=3D=3D" more preferable for net/ =
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coding style?
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Agreed, both cannot cause any troubles. =3D=3D is supposed to be better=
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from the API point of view, but=20
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>=3D is probably more readable.
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Nicolas.
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--
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