netdev - Re: [PATCH] fib6: Fix fn->leaf == NULL race when inserting new nodes in fib6 tree

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Date:	Thu, 04 Jan 2007 12:24:49 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	tgraf@...g.ch
Cc:	yoshfuji@...ux-ipv6.org, netdev@...r.kernel.org
Subject: Re: [PATCH] fib6: Fix fn->leaf == NULL race when inserting new
 nodes in fib6 tree

From: Thomas Graf <tgraf@...g.ch>
Date: Thu, 4 Jan 2007 20:21:47 +0100

> * Thomas Graf <tgraf@...g.ch> 2007-01-04 10:39
> > When inserting new nodes into a fib6 tree, the leaf pointer
> > is first to NULL and later corrected when the key gets
> > assigned. However, the tree is not locked for this period
> > of time, therefore nodes with an invalid leaf pointer
> > are accessible. Lookups that occur during this period of time
> > expect a valid leaf pointer and thus crash.
> > 
> > This patch sets the leaf pointer to ip6_null_entry during
> > this critical period of time.
> 
> Ignore this patch for now, the description is certainly inaccurate
> even though it seems to fix the issue.

Ok, no problem.
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