linux-kernel - Re: [PATCH] nvdimm/pmem: Fix an error handling path in 'pmem_attach

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Date:   Sun, 7 Nov 2021 09:11:57 -0800
From:   Ira Weiny <ira.weiny@...el.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     dan.j.williams@...el.com, vishal.l.verma@...el.com,
        dave.jiang@...el.com, nvdimm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] nvdimm/pmem: Fix an error handling path in
 'pmem_attach_disk()'

On Sat, Nov 06, 2021 at 06:27:11PM +0100, Christophe JAILLET wrote:
> If 'devm_init_badblocks()' fails, a previous 'blk_alloc_disk()' call must
> be undone.

I think this is a problem...

> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
> This patch is speculative. Several fixes on error handling paths have been
> done recently, but this one has been left as-is. There was maybe a good
> reason that I have missed for that. So review with care!
> 
> I've not been able to identify a Fixes tag that please me :(
> ---
>  drivers/nvdimm/pmem.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
> index fe7ece1534e1..c37a1e6750b3 100644
> --- a/drivers/nvdimm/pmem.c
> +++ b/drivers/nvdimm/pmem.c
> @@ -490,8 +490,9 @@ static int pmem_attach_disk(struct device *dev,
>  	nvdimm_namespace_disk_name(ndns, disk->disk_name);
>  	set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
>  			/ 512);
> -	if (devm_init_badblocks(dev, &pmem->bb))
> -		return -ENOMEM;
> +	rc = devm_init_badblocks(dev, &pmem->bb);
> +	if (rc)
> +		goto out;

But I don't see this 'out' label in the function currently?  Was that part of
your patch missing?

Ira

>  	nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_range);
>  	disk->bb = &pmem->bb;
>  
> -- 
> 2.30.2
>