linux-kernel - Re: [PATCH net-next v2] net: dsa: avoid potential use-after-free error

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Message-ID: <23b205eb-4a47-c0a2-0df0-8313aee30db5@gmail.com>
Date:   Fri, 20 Nov 2020 10:17:20 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Christian Eggers <ceggers@...i.de>, Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <olteanv@...il.com>
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2] net: dsa: avoid potential use-after-free
 error

On 11/19/20 3:09 AM, Christian Eggers wrote:
> If dsa_switch_ops::port_txtstamp() returns false, clone will be freed
> immediately. Shouldn't store a pointer to freed memory.
> 
> Signed-off-by: Christian Eggers <ceggers@...i.de>
> Fixes: 146d442c2357 ("net: dsa: Keep a pointer to the skb clone for TX timestamping")

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian