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

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Message-ID: <20200413060550.347r47zp7kmn4vkh@shells.gnugeneration.com>
Date:   Sun, 12 Apr 2020 23:05:50 -0700
From:   Vito Caputo <vcaputo@...garu.com>
To:     Rémi Denis-Courmont <remi@...lab.net>
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!

On Mon, Apr 13, 2020 at 09:01:58AM +0300, Rémi Denis-Courmont wrote:
> 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.
> 

duh, sorry for the noise, I should have re-read the code before replying.