netdev - Re: [PATCH] fix NULL pointer + success return in route lookup path

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090622085950.GA26598@ms2.inr.ac.ru>
Date:	Mon, 22 Jun 2009 12:59:50 +0400
From:	Alexey Kuznetsov <kuznet@....inr.ac.ru>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Neil Horman <nhorman@...driver.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	mbizon@...ebox.fr, dada1@...mosbay.com, pekkas@...core.fi,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org
Subject: Re: [PATCH] fix NULL pointer + success return in route lookup path

On Mon, Jun 22, 2009 at 05:43:15AM +0000, Jarek Poplawski wrote:
> Maybe it can work, but it needs a thorough checking now and adds a new
> code path to track later while looking for bugs. So, I wonder if it's
> not better to link such dsts in rt_intern_hash anyway, probably as a
> separate list, scanned only for expired entries.

Such a list already exists, it is gc list in core/dst.c.

The fix to the problem could be replacing rt_drop() with rt_free()
(adding rt_free() after the patch, which deleted rt_drop()), something like:

	if (!rt_caching(dev_net(rt->u.dst.dev))) {
		/* ..... */
+		rt_free(rt);
		goto report_and_exit;
	}

rt_free() will put the route on that gc list and it will be releases
as soon as refcnt becomes 0.

Alexey

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html