linux-kernel - Re: [PATCH] net: mscc: ocelot: null check devm

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Date:   Thu, 25 Jul 2019 17:20:57 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     navid.emamdoost@...il.com
Cc:     emamd001@....edu, kjlu@....edu, smccaman@....edu,
        secalert@...hat.com, alexandre.belloni@...tlin.com,
        UNGLinuxDriver@...rochip.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: mscc: ocelot: null check devm_kcalloc

From: Navid Emamdoost <navid.emamdoost@...il.com>
Date: Wed, 24 Jul 2019 20:56:09 -0500

> devm_kcalloc may fail and return NULL. Added the null check.
> 
> Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.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 58bde1a9eacb..52377cfdc31a 100644
> --- a/drivers/net/ethernet/mscc/ocelot_board.c
> +++ b/drivers/net/ethernet/mscc/ocelot_board.c
> @@ -257,6 +257,8 @@ 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;
>  

At the very least this leaks a reference to 'ports'.  I didn't check what other
resources obtained by this function are leaked as well by this change, please
audit before resubmitting.