linux-kernel - Re: [PATCH] lightnvm: free allocated memory when gennvm register fails

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Date:	Mon, 23 Nov 2015 09:47:12 +0100
From:	Matias Bjørling <mb@...htnvm.io>
To:	Wenwei Tao <ww.tao0320@...il.com>
CC:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH] lightnvm: free allocated memory when gennvm register
 fails

On 11/23/2015 09:29 AM, Wenwei Tao wrote:
> free allocated nvm block and gennvm lun structures when
> gennvm register fails, otherwise it will cause memory leak.
>
> Signed-off-by: Wenwei Tao <ww.tao0320@...il.com>
> ---
>   drivers/lightnvm/gennvm.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
> index ae1fb2b..03fc7a5 100644
> --- a/drivers/lightnvm/gennvm.c
> +++ b/drivers/lightnvm/gennvm.c
> @@ -211,12 +211,15 @@ static int gennvm_register(struct nvm_dev *dev)
>   	ret = gennvm_blocks_init(dev, gn);
>   	if (ret) {
>   		pr_err("gennvm: could not initialize blocks\n");
> +		gennvm_blocks_free(dev);
> +		gennvm_luns_free(dev);
>   		goto err;
>   	}
>
>   	return 1;
>   err:
>   	kfree(gn);
> +	dev->mp = NULL;
>   	return ret;
>   }
>
>
Thanks Tao, would it be okay with you if I apply the patch like this:

diff --git i/drivers/lightnvm/gennvm.c w/drivers/lightnvm/gennvm.c
index e20e74e..3969a98 100644
--- i/drivers/lightnvm/gennvm.c
+++ w/drivers/lightnvm/gennvm.c
@@ -207,6 +207,14 @@ static int gennvm_blocks_init(struct nvm_dev *dev, 
struct gen_nvm *gn)
         return 0;
  }

+static void gennvm_free(struct nvm_dev *dev)
+{
+       gennvm_blocks_free(dev);
+       gennvm_luns_free(dev);
+       kfree(dev->mp);
+       dev->mp = NULL;
+}
+
  static int gennvm_register(struct nvm_dev *dev)
  {
         struct gen_nvm *gn;
@@ -234,16 +242,13 @@ static int gennvm_register(struct nvm_dev *dev)

         return 1;
  err:
-       kfree(gn);
+       gennvm_free(dev);
         return ret;
  }

  static void gennvm_unregister(struct nvm_dev *dev)
  {
-       gennvm_blocks_free(dev);
-       gennvm_luns_free(dev);
-       kfree(dev->mp);
-       dev->mp = NULL;
+       gennvm_free(dev);
  }


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