linux-hardening - Re: [PATCH v2 1/2] wifi: mwifiex: Fix memcpy() field-spanning write warning in mwifiex_config

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Message-ID: <172918382395.970100.13551398619999494547.kvalo@kernel.org>
Date: Thu, 17 Oct 2024 16:50:25 +0000 (UTC)
From: Kalle Valo <kvalo@...nel.org>
To: Alper Nebi Yasak <alpernebiyasak@...il.com>
Cc: linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
 Francesco Dolcini <francesco@...cini.it>,
 Johannes Berg <johannes.berg@...el.com>, Kees Cook <kees@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>, Dmitry Antipov <dmantipov@...dex.ru>,
 "Gustavo A . R . Silva" <gustavoars@...nel.org>,
 Jeff Johnson <quic_jjohnson@...cinc.com>,
 Brian Norris <briannorris@...omium.org>, David Lin <yu-hao.lin@....com>,
 linux-hardening@...r.kernel.org,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Alper Nebi Yasak <alpernebiyasak@...il.com>
Subject: Re: [PATCH v2 1/2] wifi: mwifiex: Fix memcpy() field-spanning write
 warning in mwifiex_config_scan()

Alper Nebi Yasak <alpernebiyasak@...il.com> wrote:

> Replace one-element array with a flexible-array member in `struct
> mwifiex_ie_types_wildcard_ssid_params` to fix the following warning
> on a MT8173 Chromebook (mt8173-elm-hana):
> 
> [  356.775250] ------------[ cut here ]------------
> [  356.784543] memcpy: detected field-spanning write (size 6) of single field "wildcard_ssid_tlv->ssid" at drivers/net/wireless/marvell/mwifiex/scan.c:904 (size 1)
> [  356.813403] WARNING: CPU: 3 PID: 742 at drivers/net/wireless/marvell/mwifiex/scan.c:904 mwifiex_scan_networks+0x4fc/0xf28 [mwifiex]
> 
> The "(size 6)" above is exactly the length of the SSID of the network
> this device was connected to. The source of the warning looks like:
> 
>     ssid_len = user_scan_in->ssid_list[i].ssid_len;
>     [...]
>     memcpy(wildcard_ssid_tlv->ssid,
>            user_scan_in->ssid_list[i].ssid, ssid_len);
> 
> There is a #define WILDCARD_SSID_TLV_MAX_SIZE that uses sizeof() on this
> struct, but it already didn't account for the size of the one-element
> array, so it doesn't need to be changed.
> 
> Fixes: 5e6e3a92b9a4 ("wireless: mwifiex: initial commit for Marvell mwifiex driver")
> Signed-off-by: Alper Nebi Yasak <alpernebiyasak@...il.com>
> Acked-by: Brian Norris <briannorris@...omium.org>

Patch applied to wireless-next.git, thanks.

d241a139c2e9 wifi: mwifiex: Fix memcpy() field-spanning write warning in mwifiex_config_scan()

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20241007222301.24154-1-alpernebiyasak@gmail.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches