linux-kernel - Re: [PATCH] macsec: Fix memory leaks in macsec

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Date:   Fri, 22 Nov 2019 23:26:36 +0100
From:   Florian Westphal <fw@...len.de>
To:     Navid Emamdoost <navid.emamdoost@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Johannes Berg <johannes.berg@...el.com>,
        Taehee Yoo <ap420073@...il.com>,
        Andreas Steinmetz <ast@...dv.de>,
        Michal Kubecek <mkubecek@...e.cz>,
        Florian Westphal <fw@...len.de>,
        Thomas Gleixner <tglx@...utronix.de>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, emamd001@....edu
Subject: Re: [PATCH] macsec: Fix memory leaks in macsec_decrypt()

Navid Emamdoost <navid.emamdoost@...il.com> wrote:
> In the implementation of macsec_decrypt(), there are two memory leaks
> when crypto_aead_decrypt() fails. Release allocated req and skb before
> return.
> 
> Fixes: c3b7d0bd7ac2 ("macsec: fix rx_sa refcounting with decrypt callback")
> Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> ---
>  drivers/net/macsec.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
> index afd8b2a08245..34c6fb4eb9ef 100644
> --- a/drivers/net/macsec.c
> +++ b/drivers/net/macsec.c
> @@ -986,6 +986,8 @@ static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
>  	dev_hold(dev);
>  	ret = crypto_aead_decrypt(req);
>  	if (ret == -EINPROGRESS) {
> +		aead_request_free(req);
> +		kfree_skb(skb);

-EINPROGRESS means decryption is handled asynchronously, no?

>  		return ERR_PTR(ret);
>  	} else if (ret != 0) {
>  		/* decryption/authentication failed

This is the error handling/failure path.