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

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Date:   Thu, 10 Feb 2022 19:39:29 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Simon Horman <simon.horman@...igine.com>
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()

Le 10/02/2022 à 14:04, Simon Horman a écrit :
> 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

I'll send a v2.

I added it because some other maintainers have asked for it in other 
similar patches. Everyone's taste is different :).

CJ



> 
> Thanks again,
> Simon
> 
> ...
>