netdev - Re: [PATCH] net: Check the argument for listen(2)

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Message-ID: <20130628163458.GB651@order.stressinduktion.org>
Date:	Fri, 28 Jun 2013 18:34:58 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	Changli Gao <xiaosuo@...il.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] net: Check the argument for listen(2)

On Fri, Jun 28, 2013 at 06:32:34PM +0200, Hannes Frederic Sowa wrote:
> On Fri, Jun 28, 2013 at 09:29:02AM -0700, Eric Dumazet wrote:
> > On Sat, 2013-06-29 at 00:14 +0800, Changli Gao wrote:
> > > --- a/net/ipv4/af_inet.c
> > > +++ b/net/ipv4/af_inet.c
> > > @@ -198,6 +198,9 @@ int inet_listen(struct socket *sock, int backlog)
> > >  	unsigned char old_state;
> > >  	int err;
> > >  
> > > +	if (backlog >= (1 << 16))
> > > +		return EINVAL;
> > > +
> > >  	lock_sock(sk);
> > >  
> > >  	err = -EINVAL;
> > 
> > This seems pretty buggy to me.
> > 
> > 1) EINVAL is not -EINVAL
> > 
> > 2) This might break existing applications.
> 
> Yes, we should clamp the value to netdev_max_backlog.

Nonsense, somaxconn would make more sense.

Sorry,

  Hannes
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