linux-kernel - Re: [PATCH] nfp: flower: Fix a potential theorical leak in nfp_tunnel_add_shared

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Message-ID: <YgUNdJgC9dNJN82P@corigine.com>
Date:   Thu, 10 Feb 2022 14:04:52 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        John Hurley <john.hurley@...ronome.com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        oss-drivers@...igine.com, netdev@...r.kernel.org
Subject: Re: [PATCH] nfp: flower: Fix a potential theorical leak in
 nfp_tunnel_add_shared_mac()

Hi Christophe,

On Wed, Feb 09, 2022 at 07:58:47PM +0100, Christophe JAILLET wrote:
> ida_simple_get() returns an id between min (0) and max (NFP_MAX_MAC_INDEX)
> inclusive.
> So NFP_MAX_MAC_INDEX (0xff) is a valid id
> 
> In order for the error handling path to work correctly, the 'invalid'
> value for 'ida_idx' should not be in the 0..NFP_MAX_MAC_INDEX range,
> inclusive.
> 
> So set it to -1.
> 
> While at it, use ida_alloc_xxx()/ida_free() instead to
> ida_simple_get()/ida_simple_remove().
> The latter is deprecated and more verbose.
> 
> Fixes: 20cce8865098 ("nfp: flower: enable MAC address sharing for offloadable devs")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Thanks for your patch.

I agree that it is indeed a problem and your fix looks good.
I would, however, prefer if the patch was split into two:

1. Bug fix
2. ida_alloc_xxx()/ida_free() cleanup

Thanks again,
Simon

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