netdev - Re: [RFC] net: ipv6: hold locks around mrt->mfc6_cache

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Message-Id: <20150407.182409.686606754359856723.davem@davemloft.net>
Date:	Tue, 07 Apr 2015 18:24:09 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	3chas3@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC] net: ipv6: hold locks around mrt->mfc6_cache_array[]

From: chas williams <3chas3@...il.com>
Date: Mon, 06 Apr 2015 19:18:50 -0400

> setsocketopt() -> ip6mr_mfc_add() -> ip6mr_cache_resolved() -> ip6_mr_foward()
> needs some lock since it is going to read the cache array.

Nothing can change in the table while the RTNL mutex is held, which
these code paths have acquired.
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