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

[Borislav Petkov]

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@xxxxxxxxxx>
> Signed-off-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
> ---
>  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.

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