linux-kernel - Re: [PATCH] staging: r8188eu: prevent ->Ssid overflow in rtw_wx_set

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Date:   Thu, 19 May 2022 17:40:13 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Denis Efremov <denis.e.efremov@...cle.com>
Cc:     Larry.Finger@...inger.net, phil@...lpotter.co.uk,
        dan.carpenter@...cle.com, straube.linux@...il.com,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org, stable <stable@...r.kernel.org>
Subject: Re: [PATCH] staging: r8188eu: prevent ->Ssid overflow in
 rtw_wx_set_scan()

On Wed, May 18, 2022 at 11:49:27AM +0400, Denis Efremov wrote:
> 
> 
> On 5/18/22 11:00, Denis Efremov wrote:
> > This code has a check to prevent read overflow but it needs another
> > check to prevent writing beyond the end of the ->Ssid[] array.
> > 
> > Fixes: 2b42bd58b321 ("staging: r8188eu: introduce new os_dep dir for RTL8188eu driver")
> > Cc: stable <stable@...r.kernel.org>
> > Signed-off-by: Denis Efremov <denis.e.efremov@...cle.com>
> > ---
> > 
> > This patch is a copy of Dan's 74b6b20df8cf (CVE-2021-28660).
> > Drivers r8188eu and rtl8188eu share the same code.
> 
> I also found same code pattern in rtl8723bs driver in
> stable kernels 5.10, 5.4, 4.19, 4.14.
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c?h=linux-5.10.y#n1354
> I can send the same fix to stable trees if appropriate.

Please do!

thanks,

greg k-h