linux-kernel - Re: [PATCH] staging: r8188eu: fix a potential memory leak in _rtw_init_cmd

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Date:   Wed, 30 Mar 2022 13:43:33 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     xkernel.wang@...mail.com
Cc:     Larry.Finger@...inger.net, phil@...lpotter.co.uk,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: r8188eu: fix a potential memory leak in
 _rtw_init_cmd_priv()

On Wed, Mar 30, 2022 at 07:32:21PM +0800, xkernel.wang@...mail.com wrote:
> From: Xiaoke Wang <xkernel.wang@...mail.com>
> 
> In _rtw_init_cmd_priv(), if `pcmdpriv->rsp_allocated_buf` is allocated
> in failure, `pcmdpriv->cmd_allocated_buf` is not properly released.
> This patch is to free it.
> 
> Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
> ---
>  drivers/staging/r8188eu/core/rtw_cmd.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/staging/r8188eu/core/rtw_cmd.c b/drivers/staging/r8188eu/core/rtw_cmd.c
> index 56910c3..e76015e 100644
> --- a/drivers/staging/r8188eu/core/rtw_cmd.c
> +++ b/drivers/staging/r8188eu/core/rtw_cmd.c
> @@ -42,6 +42,8 @@ static int _rtw_init_cmd_priv(struct cmd_priv *pcmdpriv)
>  	pcmdpriv->rsp_allocated_buf = kzalloc(MAX_RSPSZ + 4, GFP_KERNEL);
>  
>  	if (!pcmdpriv->rsp_allocated_buf) {
> +		kfree(pcmdpriv->cmd_allocated_buf);
> +		pcmdpriv->cmd_allocated_buf = NULL;
>  		res = _FAIL;
>  		goto exit;

Shouldn't this be handled properly in the exit: portion instead?

thanks,

greg k-h