linux-kernel - Re: [PATCH] net: macsec: fix potential resource leak in macsec_add_rxsa() and macsec_add

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Message-ID: <2eefbb3d5190a2fb24ae075725166ceb2effb433.camel@redhat.com>
Date:   Tue, 05 Jul 2022 15:03:18 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Jianglei Nie <niejianglei2021@....com>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: macsec: fix potential resource leak in
 macsec_add_rxsa() and macsec_add_txsa()

Hello,

On Mon, 2022-07-04 at 20:33 +0800, Jianglei Nie wrote:
> init_rx_sa() allocates relevant resource for rx_sa->stats and rx_sa->
> key.tfm with alloc_percpu() and macsec_alloc_tfm(). When some error
> occurs after init_rx_sa() is called in macsec_add_rxsa(), the function
> released rx_sa with kfree() without releasing rx_sa->stats and rx_sa->
> key.tfm, which will lead to a resource leak.
> 
> We should call macsec_rxsa_put() instead of kfree() to decrease the ref
> count of rx_sa and release the relevant resource if the refcount is 0.
> The same bug exists in macsec_add_txsa() for tx_sa as well. This patch
> fixes the above two bugs.
> 
> Signed-off-by: Jianglei Nie <niejianglei2021@....com>

The patch LGTM. This looks like -net material, so please repost
specifying the correct tree into the patch subj and more importantnly
including a suitable 'Fixes' tag into the commit message.

Thanks!

Paolo