linux-kernel - Re: [PATCH 1/1] EDAC, mpc85xx: Fix error return code in two functions

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Message-ID: <YLSg/8REPQoX8HL7@zn.tnic>
Date:   Mon, 31 May 2021 10:40:31 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Zhen Lei <thunder.leizhen@...wei.com>
Cc:     Johannes Thumshirn <morbidrsa@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>,
        Robert Richter <rric@...nel.org>,
        Doug Thompson <dougthompson@...ssion.com>,
        Dave Jiang <djiang@...sta.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-edac <linux-edac@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] EDAC, mpc85xx: Fix error return code in two functions

On Fri, May 28, 2021 at 11:26:37AM +0800, Zhen Lei wrote:
> Fix to return -EFAULT from the error handling case instead of 0, as done
> elsewhere in its function.
> 
> Fixes: a9a753d53204 ("drivers-edac: add freescale mpc85xx driver")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
> ---
>  drivers/edac/mpc85xx_edac.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/edac/mpc85xx_edac.c b/drivers/edac/mpc85xx_edac.c
> index 67f7bc3fe5b3..b2eaa62c9412 100644
> --- a/drivers/edac/mpc85xx_edac.c
> +++ b/drivers/edac/mpc85xx_edac.c
> @@ -248,6 +248,7 @@ static int mpc85xx_pci_err_probe(struct platform_device *op)
>  
>  	if (edac_pci_add_device(pci, pdata->edac_idx) > 0) {
>  		edac_dbg(3, "failed edac_pci_add_device()\n");
> +		res = -EFAULT;

>  		goto err;
>  	}
>  
> @@ -552,6 +553,7 @@ static int mpc85xx_l2_err_probe(struct platform_device *op)
>  
>  	if (edac_device_add_device(edac_dev) > 0) {
>  		edac_dbg(3, "failed edac_device_add_device()\n");
> +		res = -EFAULT;
>  		goto err;
>  	}
>  
> -- 

EFAULT means

#define EFAULT          14      /* Bad address */

Does it make sense to you when the probe function returns a "bad
address" upon failure to add a device?

hint 1: you might wanna audit how the other drivers are calling this for
better ideas.

hint 2: while doing hint 1, you might find some more broken cases which
you could fix too.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette