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

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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

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