linux-kernel - Re: [PATCH net v2] ethtool: fix reference leak in some *

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Message-Id: <20200323.215251.2231810044873788090.davem@davemloft.net>
Date:   Mon, 23 Mar 2020 21:52:51 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     mkubecek@...e.cz
Cc:     kuba@...nel.org, netdev@...r.kernel.org, andrew@...n.ch,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v2] ethtool: fix reference leak in some *_SET
 handlers

From: Michal Kubecek <mkubecek@...e.cz>
Date: Sun, 22 Mar 2020 22:24:21 +0100 (CET)

> 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.
> 
> v2: add Fixes tags
> 
> Fixes: a53f3d41e4d3 ("ethtool: set link settings with LINKINFO_SET request")
> Fixes: bfbcfe2032e7 ("ethtool: set link modes related data with LINKMODES_SET request")
> Fixes: e54d04e3afea ("ethtool: set message mask with DEBUG_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: Andrew Lunn <andrew@...n.ch>
> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
> Reviewed-by: Jakub Kicinski <kuba@...nel.org>

Applied, thanks Michal.