netdev - Re: [Patch net] hsr: switch ->dellink() to ->ndo

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Date:   Thu, 11 Jul 2019 14:38:01 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     xiyou.wangcong@...il.com
Cc:     netdev@...r.kernel.org,
        syzbot+097ef84cdc95843fbaa8@...kaller.appspotmail.com,
        arvid.brodin@...en.se
Subject: Re: [Patch net] hsr: switch ->dellink() to ->ndo_uninit()

From: Cong Wang <xiyou.wangcong@...il.com>
Date: Tue,  9 Jul 2019 23:24:54 -0700

> Switching from ->priv_destructor to dellink() has an unexpected
> consequence: existing RCU readers, that is, hsr_port_get_hsr()
> callers, may still be able to read the port list.
> 
> Instead of checking the return value of each hsr_port_get_hsr(),
> we can just move it to ->ndo_uninit() which is called after
> device unregister and synchronize_net(), and we still have RTNL
> lock there.
> 
> Fixes: b9a1e627405d ("hsr: implement dellink to clean up resources")
> Fixes: edf070a0fb45 ("hsr: fix a NULL pointer deref in hsr_dev_xmit()")
> Reported-by: syzbot+097ef84cdc95843fbaa8@...kaller.appspotmail.com
> Cc: Arvid Brodin <arvid.brodin@...en.se>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>

Applied and queued up for -stable, thanks.