linux-kernel - Re: [PATCH] net: ocelot_board: fix a NULL pointer dereference

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Message-ID: <20190311102600.GB1637@piout.net>
Date:   Mon, 11 Mar 2019 11:26:00 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ocelot_board: fix a NULL pointer dereference

On 11/03/2019 01:36:32-0500, Kangjie Lu wrote:
> In case devm_kcalloc fails, the fix returns -ENOMEM to avoid
> NULL pointer dereference.
> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>
Reviewed-by: Alexandre Belloni <alexandre.belloni@...tlin.com>

> ---
>  drivers/net/ethernet/mscc/ocelot_board.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/mscc/ocelot_board.c b/drivers/net/ethernet/mscc/ocelot_board.c
> index e7f90101d2e0..af68abf1632a 100644
> --- a/drivers/net/ethernet/mscc/ocelot_board.c
> +++ b/drivers/net/ethernet/mscc/ocelot_board.c
> @@ -256,6 +256,8 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
>  
>  	ocelot->ports = devm_kcalloc(&pdev->dev, ocelot->num_phys_ports,
>  				     sizeof(struct ocelot_port *), GFP_KERNEL);
> +	if (!ocelot->ports)
> +		return -ENOMEM;
>  
>  	INIT_LIST_HEAD(&ocelot->multicast);
>  	ocelot_init(ocelot);
> -- 
> 2.17.1
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com