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104 lines
4.4 KiB
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104 lines
4.4 KiB
Text
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From: Vasiliy Kulikov <segoon@openwall.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 15:23:13 +0300
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Lines: 34
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Message-ID: <20110214122313.GA10062@albatros>
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References: <1297680967-11893-1-git-send-email-segoon@openwall.com>
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<4D591D04.4050000@gmail.com>
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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: Nicolas de =?iso-8859-1?Q?Peslo=FCan?=
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<nicolas.2p.debian@gmail.com>
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X-From: netdev-owner@vger.kernel.org Mon Feb 14 13:24:40 2011
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Sender: netdev-owner@vger.kernel.org
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1099712>
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Hi Nicolas,
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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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Ehh... Space after ")" is needed :)
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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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>=20
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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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>=20
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> Shouldn't it be "if (strnlen(name, sizeof(dev->name)) =3D=3D sizeof(d=
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ev->name))" instead?
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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 OK,
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strnlen() >=3D sizeof() is bad. Is "=3D=3D" more preferable for net/ c=
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oding style?
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--=20
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Vasiliy Kulikov
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http://www.openwall.com - bringing security into open computing environ=
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ments
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--
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