netdev - Re: [PATCHv1 5/7] TAP: Extending tap device create/destroy APIs

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Message-ID: <1483744559.9712.47.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Fri, 06 Jan 2017 15:15:59 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Sainath Grandhi <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.