linux-kernel - Re: [PATCH 03/15] mwifiex: avoid -Wstringop-overflow warning

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Date:   Wed,  6 May 2020 08:43:42 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     linux-kernel@...r.kernel.org,
        Amitkumar Karwar <amitkarwar@...il.com>,
        Ganapathi Bhat <ganapathi.bhat@....com>,
        Xinming Hu <huxinming820@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Bing Zhao <bzhao@...vell.com>,
        Marc Yang <yangyang@...vell.com>,
        Ramesh Radhakrishnan <rramesh@...vell.com>,
        Kiran Divekar <dkiran@...vell.com>,
        Arnd Bergmann <arnd@...db.de>,
        Nishant Sarmukadam <nishants@...vell.com>,
        Amitkumar Karwar <akarwar@...vell.com>,
        Yogesh Ashok Powar <yogeshp@...vell.com>,
        Frank Huang <frankh@...vell.com>,
        "John W. Linville" <linville@...driver.com>,
        Cathy Luo <xiaohua.luo@....com>, James Cao <zheng.cao@....com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 03/15] mwifiex: avoid -Wstringop-overflow warning

Arnd Bergmann <arnd@...db.de> wrote:

> gcc-10 reports a warning for mwifiex_cmd_802_11_key_material_v1:
> 
> drivers/net/wireless/marvell/mwifiex/sta_cmd.c: In function 'mwifiex_cmd_802_11_key_material_v1':
> cc1: warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]
> In file included from drivers/net/wireless/marvell/mwifiex/sta_cmd.c:23:
> drivers/net/wireless/marvell/mwifiex/fw.h:993:9: note: at offset 0 to object 'action' with size 2 declared here
>   993 |  __le16 action;
>       |         ^~~~~~
> 
> As the warning makes no sense, I reported it as a bug for gcc. In the
> meantime using a temporary pointer for the key data makes the code easier
> to read and stops the warning.
> 
> Fixes: 5e6e3a92b9a4 ("wireless: mwifiex: initial commit for Marvell mwifiex driver")
> Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94881
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Patch applied to wireless-drivers-next.git, thanks.

08afb432c996 mwifiex: avoid -Wstringop-overflow warning

-- 
https://patchwork.kernel.org/patch/11521661/

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