linux-kernel - RE: [PATCH] net: dsa: loop: Check for memory allocation failure

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6DCFFE715E@AcuExch.aculab.com>
Date:   Mon, 8 May 2017 12:05:32 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Christophe JAILLET' <christophe.jaillet@...adoo.fr>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "vivien.didelot@...oirfairelinux.com" 
        <vivien.didelot@...oirfairelinux.com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: RE: [PATCH] net: dsa: loop: Check for memory allocation failure

From: Christophe JAILLET
> Sent: 06 May 2017 06:30
> If 'devm_kzalloc' fails, a NULL pointer will be dereferenced.
> Return -ENOMEM instead, as done for some other memory allocation just a
> few lines above.
...
> --- a/drivers/net/dsa/dsa_loop.c
> +++ b/drivers/net/dsa/dsa_loop.c
> @@ -256,6 +256,9 @@ static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
>  		return -ENOMEM;
> 
>  	ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
> +	if (!ps)
> +		return -ENOMEM;
> +
>  	ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
>  	if (!ps->netdev)
>  		return -EPROBE_DEFER;

On the face if it this code leaks like a sieve.

	David