linux-kernel - Re: [PATCH v6 1/5] staging: rtl8723bs: fix potential out-of-bounds read in rtw_restruct_wmm

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Message-ID: <2026020716-starboard-uncurled-2334@gregkh>
Date: Sat, 7 Feb 2026 14:08:33 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Luka Gejak <lukagejak5@...il.com>
Cc: Dan Carpenter <dan.carpenter@...aro.org>, linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v6 1/5] staging: rtl8723bs: fix potential out-of-bounds
 read in  rtw_restruct_wmm_ie

On Fri, Jan 30, 2026 at 07:56:54PM +0100, Luka Gejak wrote:
> The current code checks 'i + 5 < in_len' at the end of the if statement.
> However, it accesses 'in_ie[i + 5]' before that check, which can lead
> to an out-of-bounds read. Move the length check to the beginning of the
> conditional to ensure the index is within bounds before accessing the
> array.
> 
> Fixes: 554c0a3abf21 ("staging: Add rtl8723bs sdio wifi driver")
> Cc: stable@...r.kernel.org
> Signed-off-by: Luka Gejak <lukagejak5@...il.com>
> ---
>  drivers/staging/rtl8723bs/core/rtw_mlme.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/rtl8723bs/core/rtw_mlme.c b/drivers/staging/rtl8723bs/core/rtw_mlme.c
> index 98704179ad35..7dfc2678924e 100644
> --- a/drivers/staging/rtl8723bs/core/rtw_mlme.c
> +++ b/drivers/staging/rtl8723bs/core/rtw_mlme.c
> @@ -2000,7 +2000,10 @@ int rtw_restruct_wmm_ie(struct adapter *adapter, u8 *in_ie, u8 *out_ie, uint in_
>  	while (i < in_len) {
>  		ielength = initial_out_len;
>  
> -		if (in_ie[i] == 0xDD && in_ie[i+2] == 0x00 && in_ie[i+3] == 0x50  && in_ie[i+4] == 0xF2 && in_ie[i+5] == 0x02 && i+5 < in_len) { /* WMM element ID and OUI */
> +		if (i + 5 < in_len &&
> +		    in_ie[i] == 0xDD && in_ie[i + 2] == 0x00 &&
> +		    in_ie[i + 3] == 0x50 && in_ie[i + 4] == 0xF2 &&
> +		    in_ie[i + 5] == 0x02) {
>  			for (j = i; j < i + 9; j++) {
>  				out_ie[ielength] = in_ie[j];
>  				ielength++;
> -- 
> 2.52.0
> 
> 

Nope, I can't take this, as it doesn't apply to my tree at all :(

Please rebase and resend.

thanks,

greg k-h