linux-kernel - Re: [PATCH v5] staging: r8188eu: add kfree() on an error path of rtw_xmit_resource

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Date:   Mon, 12 Sep 2022 20:41:41 +0200
From:   Philipp Hortmann <philipp.g.hortmann@...il.com>
To:     xkernel.wang@...mail.com, Larry.Finger@...inger.net,
        phil@...lpotter.co.uk, gregkh@...uxfoundation.org
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] staging: r8188eu: add kfree() on an error path of
 rtw_xmit_resource_alloc()

On 9/12/22 04:50, xkernel.wang@...mail.com wrote:
> From: Xiaoke Wang <xkernel.wang@...mail.com>
> 
> In rtw_xmit_resource_alloc(), if usb_alloc_urb() fails, then the memory
> `pxmitbuf->pallocated_buf` which is allocated by kzalloc() is not properly
> released before returning.
> So this patch adds kfree() on the above error path to release it in time.
> 
> Tested-by: Philipp Hortmann <philipp.g.hortmann@...il.com> # Edimax N150
> Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
> ---
> ChangeLog:
> v1->v2 update the description.
> v2->v3 rebase.
> v3->v4 update the description.
> v4->v5 rebase and update the corresponding subject and description.
> Note that the original function name was changed, so the subject of this
> patch is updated from "[PATCH v4] staging: r8188eu: fix potential memory
> leak in rtw_os_xmit_resource_alloc()" to "[PATCH v5] staging: r8188eu: add
> kfree() on an error path of rtw_xmit_resource_alloc()".
> In addition, thanks to Philipp Hortmann for his testing and advice.
>   drivers/staging/r8188eu/core/rtw_xmit.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/r8188eu/core/rtw_xmit.c b/drivers/staging/r8188eu/core/rtw_xmit.c
> index 67f9c05..9c39d08 100644
> --- a/drivers/staging/r8188eu/core/rtw_xmit.c
> +++ b/drivers/staging/r8188eu/core/rtw_xmit.c
> @@ -44,8 +44,10 @@ static int rtw_xmit_resource_alloc(struct adapter *padapter, struct xmit_buf *px
>   	pxmitbuf->dma_transfer_addr = 0;
>   
>   	pxmitbuf->pxmit_urb = usb_alloc_urb(0, GFP_KERNEL);
> -	if (!pxmitbuf->pxmit_urb)
> +	if (!pxmitbuf->pxmit_urb) {
> +		kfree(pxmitbuf->pallocated_buf);
>   		return _FAIL;
> +	}
>   
>   	return _SUCCESS;
>   }

Tested-by: Philipp Hortmann <philipp.g.hortmann@...il.com> # Edimax N150