netdev - Re: [RFC PATCH 1/2] net: bonding: correctly annotate RCU in bond_should_notify

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Message-ID: <59de0f9b3c4f59f7921cafb2115478fed82b1c4c.camel@sipsolutions.net>
Date: Fri, 19 Jul 2024 09:31:18 -0700
From: Johannes Berg <johannes@...solutions.net>
To: Jiri Pirko <jiri@...nulli.us>
Cc: netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>
Subject: Re: [RFC PATCH 1/2] net: bonding: correctly annotate RCU in
 bond_should_notify_peers()

On Fri, 2024-07-19 at 11:42 +0200, Jiri Pirko wrote:
> Thu, Jul 18, 2024 at 09:20:16PM CEST, johannes@...solutions.net wrote:
> > From: Johannes Berg <johannes.berg@...el.com>
> > 
> > RCU use in bond_should_notify_peers() looks wrong, since it does
> > rcu_dereference(), leaves the critical section, and uses the
> > pointer after that.
> > 
> > Luckily, it's called either inside a nested RCU critical section
> > or with the RTNL held.
> > 
> > Annotate it with rcu_dereference_rtnl() instead, and remove the
> > inner RCU critical section.
> > 
> > Signed-off-by: Johannes Berg <johannes.berg@...el.com>
> 
> Fixes 4cb4f97b7e361745281e843499ba58691112d2f8 perhaps?
> 

I don't really want to get into that discussion again :)

Thanks for looking!

johannes