linux-kernel - Re: [PATCH v4 1/2] usb: gadget: don't release an existing dev->buf

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Message-ID: <Yc8/Nsr9pPAqgtK/@rowland.harvard.edu>
Date:   Fri, 31 Dec 2021 12:34:46 -0500
From:   Alan Stern <stern@...land.harvard.edu>
To:     Hangyu Hua <hbh25y@...il.com>
Cc:     balbi@...nel.org, gregkh@...uxfoundation.org, axboe@...nel.dk,
        dan.carpenter@...cle.com, jj251510319013@...il.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] usb: gadget: don't release an existing dev->buf

On Sat, Jan 01, 2022 at 01:21:37AM +0800, Hangyu Hua wrote:
> dev->buf does not need to be released if it already exists before
> executing dev_config.
> 
> Signed-off-by: Hangyu Hua <hbh25y@...il.com>
> ---

Acked-by: Alan Stern <stern@...land.harvard.edu>

>  drivers/usb/gadget/legacy/inode.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
> index 3b58f4fc0a80..eaad03c0252f 100644
> --- a/drivers/usb/gadget/legacy/inode.c
> +++ b/drivers/usb/gadget/legacy/inode.c
> @@ -1826,8 +1826,9 @@ dev_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
>  	spin_lock_irq (&dev->lock);
>  	value = -EINVAL;
>  	if (dev->buf) {
> +		spin_unlock_irq(&dev->lock);
>  		kfree(kbuf);
> -		goto fail;
> +		return value;
>  	}
>  	dev->buf = kbuf;
>  
> -- 
> 2.25.1
>