linux-kernel - Re: [PATCH] lightnvm: pblk: fix error path in pblk_lines_alloc

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Date:   Thu, 21 Sep 2017 11:56:46 +0200
From:   Javier González <jg@...htnvm.io>
To:     Rakesh Pandit <rakesh@...era.com>
Cc:     Matias Bjørling <mb@...htnvm.io>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lightnvm: pblk: fix error path in
 pblk_lines_alloc_metadata

> On 20 Sep 2017, at 21.50, Rakesh Pandit <rakesh@...era.com> wrote:
> 
> Use appropriate memory free calls based on allocation type used and
> also fix number of times free is called if kmalloc fails.
> 
> Signed-off-by: Rakesh Pandit <rakesh@...era.com>
> ---
> drivers/lightnvm/pblk-init.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
> index 7cf4b53..470ef04 100644
> --- a/drivers/lightnvm/pblk-init.c
> +++ b/drivers/lightnvm/pblk-init.c
> @@ -624,12 +624,16 @@ static int pblk_lines_alloc_metadata(struct pblk *pblk)
> 
> fail_free_emeta:
> 	while (--i >= 0) {
> -		vfree(l_mg->eline_meta[i]->buf);
> +		if (l_mg->emeta_alloc_type == PBLK_VMALLOC_META)
> +			vfree(l_mg->eline_meta[i]->buf);
> +		else
> +			kfree(l_mg->eline_meta[i]->buf);
> 		kfree(l_mg->eline_meta[i]);
> 	}
> 
> +	i = PBLK_DATA_LINES;
> fail_free_smeta:
> -	for (i = 0; i < PBLK_DATA_LINES; i++)
> +	while (--i >= 0)
> 		kfree(l_mg->sline_meta[i]);

It is safe to use kfree on NULL pointers. No need to do this. You can
either send a new patch, or we can change it when picking it up.

> 
> 	return -ENOMEM;
> --
> 2.5.0

Rest looks good.


Reviewed-by: Javier González <javier@...xlabs.com>


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