linux-kernel - Re: [PATCH] IB: check for memory allocation failure

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Date:	Thu, 08 Jan 2009 15:05:58 +0100
From:	Niels de Vos <niels.devos@...cor-nixdorf.com>
To:	Eugene Teo <eugeneteo@...nel.org>
CC:	linux-kernel@...r.kernel.org, rolandd@...co.com,
	sean.hefty@...el.com, hal.rosenstock@...il.com
Subject: Re: [PATCH] IB: check for memory allocation failure

Hi Eugene,

please see below.

Cheers,
Niels


Eugene Teo wrote:
> Fix error-path NULL deref in c2_register_device().
> 
> Signed-off-by: Eugene Teo <eugeneteo@...nel.org>
> ---
>  drivers/infiniband/hw/amso1100/c2_provider.c |   14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/amso1100/c2_provider.c b/drivers/infiniband/hw/amso1100/c2_provider.c
> index 5119d65..8cede6c 100644
> --- a/drivers/infiniband/hw/amso1100/c2_provider.c
> +++ b/drivers/infiniband/hw/amso1100/c2_provider.c
> @@ -780,11 +780,11 @@ int c2_register_device(struct c2_dev *dev)
>  	/* Register pseudo network device */
>  	dev->pseudo_netdev = c2_pseudo_netdev_init(dev);
>  	if (!dev->pseudo_netdev)
> -		goto out3;
> +		goto out4;
>
>  	ret = register_netdev(dev->pseudo_netdev);
>  	if (ret)
> -		goto out2;
> +		goto out3;
>  
>  	pr_debug("%s:%u\n", __func__, __LINE__);
>  	strlcpy(dev->ibdev.name, "amso%d", IB_DEVICE_NAME_MAX);
> @@ -851,6 +851,8 @@ int c2_register_device(struct c2_dev *dev)
>  	dev->ibdev.post_recv = c2_post_receive;
>  
>  	dev->ibdev.iwcm = kmalloc(sizeof(*dev->ibdev.iwcm), GFP_KERNEL);
> +	if (!dev->ibdev.iwcm)
> +		goto out2;

Is it not needed to set 'ret = -ENOMEM'?


>  	dev->ibdev.iwcm->add_ref = c2_add_ref;
>  	dev->ibdev.iwcm->rem_ref = c2_rem_ref;
>  	dev->ibdev.iwcm->get_qp = c2_get_qp;
> @@ -870,15 +872,17 @@ int c2_register_device(struct c2_dev *dev)
>  		if (ret)
>  			goto out0;
>  	}
> -	goto out3;
> +	goto out4;
>  
>  out0:
>  	ib_unregister_device(&dev->ibdev);
>  out1:
> -	unregister_netdev(dev->pseudo_netdev);
> +	kfree(dev->ibdev.iwcm);
>  out2:
> -	free_netdev(dev->pseudo_netdev);
> +	unregister_netdev(dev->pseudo_netdev);
>  out3:
> +	free_netdev(dev->pseudo_netdev);
> +out4:
>  	pr_debug("%s:%u ret=%d\n", __func__, __LINE__, ret);
>  	return ret;
>  }
> 
> --
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