netdev - Re: kernel BUG at net/phonet/socket.c:LINE!

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Message-ID: <2585533.60Y2ixrnJE@basile.remlab.net>
Date:   Mon, 13 Apr 2020 09:01:58 +0300
From:   Rémi Denis-Courmont <remi@...lab.net>
To:     Vito Caputo <vcaputo@...garu.com>
Cc:     netdev@...r.kernel.org, courmisch@...il.com, davem@...emloft.net,
        kuba@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: kernel BUG at net/phonet/socket.c:LINE!

Le maanantaina 13. huhtikuuta 2020, 8.49.14 EEST Vito Caputo a écrit :
> > If we are to distinguish the two error scenarii, then it's the rebind 
> > case
> > that needs a different error, but EINVAL is consistent with INET.
> 
> Isn't the existing code is bugged if treating -EINVAL as valid and a rebind?
> 
> The invalid size will return a NULL sobject but -EINVAL, triggering the
> BUG_ON.

How do you pass an invalid size? It's a constant `sizeof(struct sockaddr_pn)` 
in that code path.

-- 
Rémi Denis-Courmont
Tapiolan uusi kaupunki, Uudenmaan tasavalta