linux-kernel - Re: [PATCH v2 2/3] staging: rtl8723bs: fix memory leak in rtw_cfg80211_inform

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Message-ID: <aWCdQhZL0THdJ88s@stanley.mountain>
Date: Fri, 9 Jan 2026 09:16:34 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Samasth Norway Ananda <samasth.norway.ananda@...cle.com>
Cc: gregkh@...uxfoundation.org, linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] staging: rtl8723bs: fix memory leak in
 rtw_cfg80211_inform_bss()

On Thu, Jan 08, 2026 at 10:16:10AM -0800, Samasth Norway Ananda wrote:
> After successfully allocating buf with kzalloc(), if
> cfg80211_inform_bss_frame() returns NULL, the code jumps to the exit
> label without freeing buf, causing a memory leak. Add kfree(buf) before
> the goto to properly free the buffer in this error case.
> 
> Signed-off-by: Samasth Norway Ananda <samasth.norway.ananda@...cle.com>
> ---
>  drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c b/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c
> index 60edeae1cffe..d80e23cfdf8d 100644
> --- a/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c
> +++ b/drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c
> @@ -314,8 +314,10 @@ struct cfg80211_bss *rtw_cfg80211_inform_bss(struct adapter *padapter, struct wl
>  	bss = cfg80211_inform_bss_frame(wiphy, notify_channel, (struct ieee80211_mgmt *)buf,
>  					len, notify_signal, GFP_ATOMIC);
>  
> -	if (unlikely(!bss))
> +	if (unlikely(!bss)) {
> +		kfree(buf);
>  		goto exit;
> +	}
>  
>  	cfg80211_put_bss(wiphy, bss);
>  	kfree(buf);

This code is so ugly but that's not really related to your patch...

Reviewed-by: Dan Carpenter <dan.carpenter@...aro.org>

regards,
dan carpenter