linux-kernel - Re: [PATCH] staging: rtl8192u: add error handling for usb_alloc

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Message-ID: <20180615111525.GA27391@kroah.com>
Date:   Fri, 15 Jun 2018 13:15:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Zhouyang Jia <jiazhouyang09@...il.com>
Cc:     devel@...verdev.osuosl.org, Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@...il.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Shreeya Patel <shreeya.patel23498@...il.com>,
        Colin Ian King <colin.king@...onical.com>
Subject: Re: [PATCH] staging: rtl8192u: add error handling for usb_alloc_urb

On Mon, Jun 11, 2018 at 04:31:11PM +0800, Zhouyang Jia wrote:
> When usb_alloc_urb fails, the lack of error-handling code may
> cause unexpected results.
> 
> This patch adds error-handling code after calling usb_alloc_urb.
> 
> Signed-off-by: Zhouyang Jia <jiazhouyang09@...il.com>
> ---
>  drivers/staging/rtl8192u/r8192U_core.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/staging/rtl8192u/r8192U_core.c b/drivers/staging/rtl8192u/r8192U_core.c
> index 7a0dbc0..3f09615 100644
> --- a/drivers/staging/rtl8192u/r8192U_core.c
> +++ b/drivers/staging/rtl8192u/r8192U_core.c
> @@ -1666,6 +1666,9 @@ static short rtl8192_usb_initendpoints(struct net_device *dev)
>  		void *oldaddr, *newaddr;
>  
>  		priv->rx_urb[16] = usb_alloc_urb(0, GFP_KERNEL);
> +		if (!priv->rx_urb[16])
> +			return -ENOMEM;
> +

You just leaked memory :(

Well, this whole function leaks memory on the error paths, like here:

>  		priv->oldaddr = kmalloc(16, GFP_KERNEL);
>  		if (!priv->oldaddr)
>  			return -ENOMEM;

So can you fix this all up at the same time?

thanks,

greg k-h