linux-kernel - Re: [PATCH] uio: fix allocating minor id for uio device

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Thu, 31 Mar 2011 19:55:13 +0200
From:	"Hans J. Koch" <hjk@...sjkoch.de>
To:	Hillf Danton <dhillf@...il.com>
Cc:	"Hans J. Koch" <hjk@...sjkoch.de>, Greg KH <gregkh@...e.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] uio: fix allocating minor id for uio device

On Thu, Mar 31, 2011 at 08:38:47PM +0800, Hillf Danton wrote:
> The number of uio devices that could be used should be less than
> UIO_MAX_DEVICES by design, and this work guards any cases in which id
> more than UIO_MAX_DEVICES is utilized.

Looks good.

Thanks for your work,
Hans

> 
> Signed-off-by: Hillf Danton <dhillf@...il.com>

Signed-off-by: Hans J. Koch <hjk@...sjkoch.de>

> ---
> 
> --- a/drivers/uio/uio.c	2011-01-05 08:50:20.000000000 +0800
> +++ b/drivers/uio/uio.c	2011-03-31 20:43:44.000000000 +0800
> @@ -381,7 +381,13 @@ static int uio_get_minor(struct uio_devi
>  			retval = -ENOMEM;
>  		goto exit;
>  	}
> -	idev->minor = id & MAX_ID_MASK;
> +	if (id < UIO_MAX_DEVICES) {
> +		idev->minor = id;
> +	} else {
> +		dev_err(idev->dev, "too many uio devices\n");
> +		retval = -EINVAL;
> +		idr_remove(&uio_idr, id);
> +	}
>  exit:
>  	mutex_unlock(&minor_lock);
>  	return retval;
> 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/