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Date: Thu, 8 Jun 2017 17:59:32 -0700 From: Cong Wang <xiyou.wangcong@...il.com> To: Eric Dumazet <eric.dumazet@...il.com> Cc: Xin Long <lucien.xin@...il.com>, Andrey Konovalov <andreyknvl@...gle.com>, "David S. Miller" <davem@...emloft.net>, netdev <netdev@...r.kernel.org> Subject: Re: [PATCH net] ipv4: igmp: fix a use after free On Thu, Jun 8, 2017 at 1:33 PM, Eric Dumazet <eric.dumazet@...il.com> wrote: > I mentioned (in https://lkml.org/lkml/2017/5/31/619 ) that we might need > to defer freeing after rcu grace period but for some reason decided it > was not needed. This one makes sense, it is the second time I saw the use-after-free in igmp code, both are because we don't respect the RCU rule to free an element in the list. > > What about : But not sure if all ip_ma_put() callers want ip_mc_clear_src().
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