linux-kernel - Re: [PATCH] EDAC/amd64: avoid -Wformat-security warning

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Message-ID: <20251230163719.GAaVP_v7oYD3lEEcyu@fat_crate.local>
Date: Tue, 30 Dec 2025 17:37:19 +0100
From: Borislav Petkov <bp@...en8.de>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Yazen Ghannam <yazen.ghannam@....com>, Tony Luck <tony.luck@...el.com>,
	Avadhut Naik <avadhut.naik@....com>, Arnd Bergmann <arnd@...db.de>,
	Ingo Molnar <mingo@...nel.org>, Qiuxu Zhuo <qiuxu.zhuo@...el.com>,
	Thorsten Blum <thorsten.blum@...ux.dev>,
	Mario Limonciello <mario.limonciello@....com>,
	linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] EDAC/amd64: avoid -Wformat-security warning

On Thu, Dec 04, 2025 at 11:02:25AM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Using a variable as a format string causes a (default-disabled) warning:
> 
> drivers/edac/amd64_edac.c: In function 'per_family_init':
> drivers/edac/amd64_edac.c:3914:17: error: format not a string literal and no format arguments [-Werror=format-security]
>  3914 |                 scnprintf(pvt->ctl_name, sizeof(pvt->ctl_name), tmp_name);
>       |                 ^~~~~~~~~
> 
> The code here is safe, but in order to enable the warning by default in
> the future, change this instance to pass the name indirectly.
> 
> Fixes: e9abd990aefd ("EDAC/amd64: Generate ctl_name string at runtime")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/edac/amd64_edac.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
> index 2391f3469961..63fca0ee2c23 100644
> --- a/drivers/edac/amd64_edac.c
> +++ b/drivers/edac/amd64_edac.c
> @@ -3911,7 +3911,7 @@ static int per_family_init(struct amd64_pvt *pvt)
>  	}
>  
>  	if (tmp_name)
> -		scnprintf(pvt->ctl_name, sizeof(pvt->ctl_name), tmp_name);
> +		scnprintf(pvt->ctl_name, sizeof(pvt->ctl_name), "%s", tmp_name);
>  	else
>  		scnprintf(pvt->ctl_name, sizeof(pvt->ctl_name), "F%02Xh_M%02Xh",
>  			  pvt->fam, pvt->model);
> -- 

Applied, thanks.

-- 
Regards/Gruss,
    Boris.

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