linux-kernel - RE: [PATCHv1 5/7] TAP: Extending tap device create/destroy APIs

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Date:   Tue, 17 Jan 2017 23:07:37 +0000
From:   "Grandhi, Sainath" <sainath.grandhi@...el.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "mahesh@...dewar.net" <mahesh@...dewar.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCHv1 5/7] TAP: Extending tap device create/destroy APIs



> -----Original Message-----
> From: Eric Dumazet [mailto:eric.dumazet@...il.com]
> Sent: Friday, January 06, 2017 3:16 PM
> To: Grandhi, Sainath <sainath.grandhi@...el.com>
> Cc: netdev@...r.kernel.org; davem@...emloft.net;
> mahesh@...dewar.net; linux-kernel@...r.kernel.org
> Subject: Re: [PATCHv1 5/7] TAP: Extending tap device create/destroy APIs
> 
> On Fri, 2017-01-06 at 14:33 -0800, Sainath Grandhi wrote:
> 
> > +static int tap_list_add(dev_t major, const char *device_name) {
> > +	int err = 0;
> > +	struct major_info *tap_major;
> > +
> > +	tap_major = kzalloc(sizeof(*tap_major), GFP_ATOMIC);
> > +
> > +	tap_major->major = MAJOR(major);
> > +
> 
> 
> kzalloc() can perfectly return NULL.
> 
> You do not want to crash it that happens.
> 
Thanks for pointing out. Will send out next version that takes care of null pointer