netdev - Re: [PATCH net] mac80211: mesh: fix mesh_pathtbl

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Date:   Fri, 04 Dec 2020 17:27:52 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        syzbot <syzkaller@...glegroups.com>,
        linux-wireless@...r.kernel.org
Subject: Re: [PATCH net] mac80211: mesh: fix mesh_pathtbl_init() error path

On Fri, 2020-12-04 at 17:26 +0100, Johannes Berg wrote:
> On Fri, 2020-12-04 at 08:24 -0800, Eric Dumazet wrote:
> > From: Eric Dumazet <edumazet@...gle.com>
> > 
> > If tbl_mpp can not be allocated, we call mesh_table_free(tbl_path)
> > while tbl_path rhashtable has not yet been initialized, which causes
> > panics.
> 
> Thanks Eric!
> 
> I was going to ask how you ran into this ...
> 
> > Reported-by: syzbot <syzkaller@...glegroups.com>
> 
> Until I saw this - but doesn't syzbot normally want a
> "syzbot+somehashid@..." as the reported-by?
> 
> 
> > --- a/net/mac80211/mesh_pathtbl.c
> > +++ b/net/mac80211/mesh_pathtbl.c
> > @@ -60,6 +60,7 @@ static struct mesh_table *mesh_table_alloc(void)
> >  	atomic_set(&newtbl->entries,  0);
> >  	spin_lock_init(&newtbl->gates_lock);
> >  	spin_lock_init(&newtbl->walk_lock);
> > +	rhashtable_init(&newtbl->rhead, &mesh_rht_params);
> >  
> >  	return newtbl;
> >  }
> > @@ -773,9 +774,6 @@ int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata)
> >  		goto free_path;
> >  	}
> >  
> > -	rhashtable_init(&tbl_path->rhead, &mesh_rht_params);
> > -	rhashtable_init(&tbl_mpp->rhead, &mesh_rht_params);
> > 
> 
> Hmm. There were two calls, now there's only one? Is that a bug, or am I
> missing something?

Umm, never mind.

johannes