linux-kernel - Re: [patch 7/8] ecryptfs: use kzfree()

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Date:	Mon, 16 Feb 2009 12:02:04 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Pekka Enberg <penberg@...helsinki.fi>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Tyler Hicks <tyhicks@...ux.vnet.ibm.com>
Subject: Re: [patch 7/8] ecryptfs: use kzfree()

On Mon, 16 Feb 2009 15:29:33 +0100 Johannes Weiner <hannes@...xchg.org> wrote:

> --- a/fs/ecryptfs/keystore.c
> +++ b/fs/ecryptfs/keystore.c
> @@ -740,8 +740,7 @@ ecryptfs_write_tag_70_packet(char *dest,
>  out_release_free_unlock:
>  	crypto_free_hash(s->hash_desc.tfm);
>  out_free_unlock:
> -	memset(s->block_aligned_filename, 0, s->block_aligned_filename_size);
> -	kfree(s->block_aligned_filename);
> +	kzfree(s->block_aligned_filename);
>  out_unlock:
>  	mutex_unlock(s->tfm_mutex);
>  out:
> --- a/fs/ecryptfs/messaging.c
> +++ b/fs/ecryptfs/messaging.c
> @@ -291,8 +291,7 @@ int ecryptfs_exorcise_daemon(struct ecry
>  	if (daemon->user_ns)
>  		put_user_ns(daemon->user_ns);
>  	mutex_unlock(&daemon->mux);
> -	memset(daemon, 0, sizeof(*daemon));
> -	kfree(daemon);
> +	kzfree(daemon);
>  out:
>  	return rc;
>  }

Except for this one and the crypto one, which might have been done for
security reasons.

Even though both of them forgot to add a comment explaining this, which
is bad, wrong, stupid and irritating.  Sigh.
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