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

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Message-ID: <20200322134356.55f7d9b8@kicinski-fedora-PC1C0HJN>
Date:   Sun, 22 Mar 2020 13:43:56 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] ethtool: fix reference leak in some *_SET handlers

On Sun, 22 Mar 2020 21:15:51 +0100 (CET) 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.

Fixes: e54d04e3afea ("ethtool: set message mask with DEBUG_SET request")
Fixes: a53f3d41e4d3 ("ethtool: set link settings with LINKINFO_SET request")
Fixes: bfbcfe2032e7 ("ethtool: set link modes related data with LINKMODES_SET request")
Fixes: 8d425b19b305 ("ethtool: set wake-on-lan settings with WOL_SET request")
 
> Reported-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Michal Kubecek <mkubecek@...e.cz>

Reviewed-by: Jakub Kicinski <kuba@...nel.org>