netdev - Re: [PATCH net] tipc: change to check tipc_own_id to return in tipc_net

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Date:   Tue, 26 Mar 2019 11:21:58 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, jon.maloy@...csson.com,
        ying.xue@...driver.com, tipc-discussion@...ts.sourceforge.net,
        syzkaller@...glegroups.com
Subject: Re: [PATCH net] tipc: change to check tipc_own_id to return in
 tipc_net_stop

From: Xin Long <lucien.xin@...il.com>
Date: Sun, 24 Mar 2019 00:48:22 +0800

> When running a syz script, a panic occurred:
 ...
> It was caused by the netns freed without deleting the discoverer timer,
> while later on the netns would be accessed in the timer handler.
> 
> The timer should have been deleted by tipc_net_stop() when cleaning up a
> netns. However, tipc has been able to enable a bearer and start d->timer
> without the local node_addr set since Commit 52dfae5c85a4 ("tipc: obtain
> node identity from interface by default"), which caused the timer not to
> be deleted in tipc_net_stop() then.
> 
> So fix it in tipc_net_stop() by changing to check local node_id instead
> of local node_addr, as Jon suggested.
> 
> While at it, remove the calling of tipc_nametbl_withdraw() there, since
> tipc_nametbl_stop() will take of the nametbl's freeing after.
> 
> Fixes: 52dfae5c85a4 ("tipc: obtain node identity from interface by default")
> Reported-by: syzbot+a25307ad099309f1c2b9@...kaller.appspotmail.com
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied and queued up for -stable, anks Xin!