linux-kernel - Re: staging: possible buffer overflow in rtw_wx_set_scan function in driver/staging/rtl8723bs

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Message-ID: <YSSfiSnFSE/D7sw3@kroah.com>
Date:   Tue, 24 Aug 2021 09:28:09 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     iLifetruth <yixiaonn@...il.com>
Cc:     Fabio Aiuto <fabioaiuto83@...il.com>, ross.schm.dev@...il.com,
        marcocesati@...il.com, insafonov@...il.com,
        linux-kernel@...r.kernel.org, Qiang Liu <cyruscyliu@...il.com>,
        yajin@...kernel.org
Subject: Re: staging: possible buffer overflow in rtw_wx_set_scan function in
 driver/staging/rtl8723bs

On Tue, Aug 24, 2021 at 03:04:04PM +0800, iLifetruth wrote:
> Here are the fixes and the contents of the patch file we suggest.
> 
> [PATCH]staging: rtl8723bs: prevent ->ssid overflow in rtw_wx_set_scan()
> 
> This fixing patch is ported from the upstream commit
> 74b6b20df8cf(staging: rtl8188eu: prevent ->ssid overflow in
> rtw_wx_set_scan()) which fixes on another driver numbered rtl8188eu.
> This code has a check to prevent read overflow but it needs another
> check to prevent writing beyond the end of the ->ssid[] array in
> driver rtl8723bs.
> 
> ---
>  drivers/staging/rtl8723bs/os_dep/ioctl_linux.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> index f95000df8942..3b859b71bf43 100644
> --- a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> +++ b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> @@ -1222,9 +1222,9 @@ static int rtw_wx_set_scan(struct net_device
> *dev, struct iw_request_info *a,
> 
>                                 sec_len = *(pos++); len -= 1;
> 
> -                               if (sec_len > 0 && sec_len <= len) {
> +                               if (sec_len > 0 && sec_len <= len &&
> sec_len<= 32) {
>                                         ssid[ssid_index].SsidLength = sec_len;
> -                                       memcpy(ssid[ssid_index].Ssid,
> pos, ssid[ssid_index].SsidLength);
> +                                       memcpy(ssid[ssid_index].Ssid,
> pos, sec_len);
>                                         ssid_index++;
>                                 }
> 
> --

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.

You are receiving this message because of the following common error(s)
as indicated below:

- Your patch is malformed (tabs converted to spaces, linewrapped, etc.)
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- Your patch does not have a Signed-off-by: line.  Please read the
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If you wish to discuss this problem further, or you have questions about
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thanks,

greg k-h's patch email bot