linux-kernel - Re: [PATCH] fs/ocfs2/dlm/dlmlock.c: free kmem_cache_zalloc'd data using kmem_cache

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Date:	Sun, 21 Aug 2011 21:28:39 -0700
From:	Joel Becker <jlbec@...lplan.org>
To:	Julia Lawall <julia@...u.dk>
Cc:	Mark Fasheh <mfasheh@...e.com>, kernel-janitors@...r.kernel.org,
	Wengang Wang <wen.gang.wang@...cle.com>,
	Tao Ma <boyu.mt@...bao.com>, ocfs2-devel@....oracle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fs/ocfs2/dlm/dlmlock.c: free kmem_cache_zalloc'd data
 using kmem_cache_free

this patch is now in the fixes branch of ocfs2.git.

On Sat, Jul 09, 2011 at 06:04:39PM +0200, Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> Memory allocated using kmem_cache_zalloc should be freed using
> kmem_cache_free, not kfree.
> 
> The semantic patch that fixes this problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression x,e,e1,e2;
> @@
> 
> x = kmem_cache_zalloc(e1,e2)
> ... when != x = e
> ?-kfree(x)
> +kmem_cache_free(e1,x)
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
>  fs/ocfs2/dlm/dlmlock.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff -u -p a/fs/ocfs2/dlm/dlmlock.c b/fs/ocfs2/dlm/dlmlock.c
> --- a/fs/ocfs2/dlm/dlmlock.c
> +++ b/fs/ocfs2/dlm/dlmlock.c
> @@ -440,7 +440,7 @@ struct dlm_lock * dlm_new_lock(int type,
>  		/* zero memory only if kernel-allocated */
>  		lksb = kzalloc(sizeof(*lksb), GFP_NOFS);
>  		if (!lksb) {
> -			kfree(lock);
> +			kmem_cache_free(dlm_lock_cache, lock);
>  			return NULL;
>  		}
>  		kernel_allocated = 1;
> 
> --
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