linux-kernel - Re: [PATCH 6/7] keys: Add a keyctl to move a key between keyrings

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Date:   Wed, 29 May 2019 06:51:57 +1000 (AEST)
From:   James Morris <jmorris@...ei.org>
To:     David Howells <dhowells@...hat.com>
cc:     keyrings@...r.kernel.org, linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] keys: Add a keyctl to move a key between keyrings

On Wed, 22 May 2019, David Howells wrote:

> +
> +	if (flags & ~KEYCTL_MOVE_EXCL)
> +		return -EINVAL;
> +
> +	key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_NEED_LINK);
> +	if (IS_ERR(key_ref)) {
> +		ret = PTR_ERR(key_ref);
> +		goto error;
> +	}

This could probably be a simple return, as there is no cleanup.

> +
> +	from_ref = lookup_user_key(from_ringid, 0, KEY_NEED_WRITE);
> +	if (IS_ERR(from_ref)) {
> +		ret = PTR_ERR(from_ref);
> +		goto error2;
> +	}
> +
> +	to_ref = lookup_user_key(to_ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE);
> +	if (IS_ERR(to_ref)) {
> +		ret = PTR_ERR(to_ref);
> +		goto error3;
> +	}
> +
> +	ret = key_move(key_ref_to_ptr(key_ref), key_ref_to_ptr(from_ref),
> +		       key_ref_to_ptr(to_ref), flags);
> +
> +	key_ref_put(to_ref);
> +error3:
> +	key_ref_put(from_ref);
> +error2:
> +	key_ref_put(key_ref);
> +error:
> +	return ret;
> +}
> +


-- 
James Morris
<jmorris@...ei.org>