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

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Message-ID: <20200322212509.GG31519@unicorn.suse.cz>
Date:   Sun, 22 Mar 2020 22:25:09 +0100
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Jakub Kicinski <kuba@...nel.org>
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, Mar 22, 2020 at 02:06:23PM -0700, Jakub Kicinski wrote:
> On Sun, 22 Mar 2020 21:51:09 +0100 Michal Kubecek wrote:
> > On Sun, Mar 22, 2020 at 01:43:56PM -0700, Jakub Kicinski wrote:
> > > 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")  
> > 
> > Yes, thank you, I forgot about Fixes tags.
> > 
> > Should I resubmit or will patchworks pick the tags from your reply?
> 
> Patchwork sees them, I think, but I don't think it adds them to the
> patch as downloaded by git-pw. Probably easiest to repost.

Sent v2 with Fixes and Reviewed-by tags.

Michal

> > > > Reported-by: Andrew Lunn <andrew@...n.ch>
> > > > Signed-off-by: Michal Kubecek <mkubecek@...e.cz>  
> > > 
> > > Reviewed-by: Jakub Kicinski <kuba@...nel.org>  
>