linux-kernel - Re: [PATCH net] ethtool: fix reference leak in some *

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Message-ID: <20200322202351.GE3819@lunn.ch>
Date:   Sun, 22 Mar 2020 21:23:51 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] ethtool: fix reference leak in some *_SET handlers

On Sun, Mar 22, 2020 at 09:15:51PM +0100, Michal Kubecek wrote:
> Andrew noticed that some handlers for *_SET commands leak a netdev
> reference if required ethtool_ops callbacks do not exist. A simple
> reproducer would be e.g.
> 
>   ip link add veth1 type veth peer name veth2
>   ethtool -s veth1 wol g
>   ip link del veth1
> 
> Make sure dev_put() is called when ethtool_ops check fails.
> 
> Reported-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Michal Kubecek <mkubecek@...e.cz>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew