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

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Message-ID: <20070104192147.GD8693@postel.suug.ch>
Date:	Thu, 4 Jan 2007 20:21:47 +0100
From:	Thomas Graf <tgraf@...g.ch>
To:	davem@...emloft.net
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

* 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.
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