linux-kernel - Re: [PATCH][next] wifi: mwifiex: Fix memcpy() field-spanning write warning in mwifiex_cmd_802_11_scan

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Message-ID: <Zsd6YE6z5CNWQocz@google.com>
Date: Thu, 22 Aug 2024 10:50:24 -0700
From: Brian Norris <briannorris@...omium.org>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Francesco Dolcini <francesco@...cini.it>, Kalle Valo <kvalo@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] wifi: mwifiex: Fix memcpy() field-spanning write
 warning in mwifiex_cmd_802_11_scan_ext()

On Wed, Aug 21, 2024 at 03:23:51PM -0600, Gustavo A. R. Silva wrote:
> Replace one-element array with a flexible-array member in
> `struct host_cmd_ds_802_11_scan_ext`.
> 
> With this, fix the following warning:
> 
> elo 16 17:51:58 surfacebook kernel: ------------[ cut here ]------------
> elo 16 17:51:58 surfacebook kernel: memcpy: detected field-spanning write (size 243) of single field "ext_scan->tlv_buffer" at drivers/net/wireless/marvell/mwifiex/scan.c:2239 (size 1)
> elo 16 17:51:58 surfacebook kernel: WARNING: CPU: 0 PID: 498 at drivers/net/wireless/marvell/mwifiex/scan.c:2239 mwifiex_cmd_802_11_scan_ext+0x83/0x90 [mwifiex]
> 
> Reported-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Closes: https://lore.kernel.org/linux-hardening/ZsZNgfnEwOcPdCly@black.fi.intel.com/
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Acked-by: Brian Norris <briannorris@...omium.org>