linux-kernel - Re: [PATCH v5] driver: uio: fix possible memory leak in uio

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Date:   Thu, 31 Jan 2019 16:36:21 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Liu Jian <liujian56@...wei.com>
Cc:     xiubli@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] driver: uio: fix possible memory leak in uio_open

On Wed, Jan 23, 2019 at 06:38:24AM +0800, Liu Jian wrote:
> If 'idev->info' is NULL, we need to  free 'listener'
> 
> Fixes: 57c5f4df0a5a ("uio: fix crash after the device is unregistered")
> Signed-off-by: Liu Jian <liujian56@...wei.com>
> ---
> v1->v2:
> rename the "err_infoopen" to "err_idev_info"
> v2->3:
> put the extra info after the "--"
> v3-v4:
> add git log
> v4-v5:
> correct git log
> 
>  drivers/uio/uio.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
> index 1313422..b4ae2d9 100644
> --- a/drivers/uio/uio.c
> +++ b/drivers/uio/uio.c
> @@ -491,18 +491,19 @@ static int uio_open(struct inode *inode, struct file *filep)
>  	if (!idev->info) {
>  		mutex_unlock(&idev->info_lock);
>  		ret = -EINVAL;
> -		goto err_alloc_listener;
> +		goto err_idev_info;
>  	}
>  
>  	if (idev->info && idev->info->open)
>  		ret = idev->info->open(idev->info, inode);
>  	mutex_unlock(&idev->info_lock);
>  	if (ret)
> -		goto err_infoopen;
> +		goto err_idev_info;
>  
>  	return 0;
>  
> -err_infoopen:
> +err_idev_info:
> +	filep->private_data = NULL;
>  	kfree(listener);
>  
>  err_alloc_listener:
> -- 
> 2.7.4
> 

This does not apply to my tree at all :(

Please rebase it against the char-misc-next branch of my char-misc.git
tree and resend.

thanks,

greg k-h