linux-kernel - Re: [PATCH 4.19 23/37] ipv4: Update exception handling for multipath routes via same device

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Date:   Tue, 29 Sep 2020 14:26:44 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Pavel Machek <pavel@...x.de>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Kfir Itzhak <mastertheknife@...il.com>,
        David Ahern <dsahern@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 4.19 23/37] ipv4: Update exception handling for multipath
 routes via same device

On Sat 2020-09-26 17:46:35, Greg Kroah-Hartman wrote:
> On Fri, Sep 25, 2020 at 06:51:34PM +0200, Pavel Machek wrote:
> > Hi!
> > 
> > > [ Upstream commit 2fbc6e89b2f1403189e624cabaf73e189c5e50c6 ]
> > > 
> > > Kfir reported that pmtu exceptions are not created properly for
> > > deployments where multipath routes use the same device.
> > 
> > This is mismerged (in a way that does not affect functionality):
> > 
> > 
> > > @@ -779,6 +779,8 @@ static void __ip_do_redirect(struct rtab
> > >  			if (fib_lookup(net, fl4, &res, 0) == 0) {
> > >  				struct fib_nh *nh = &FIB_RES_NH(res);
> > >  
> > > +				fib_select_path(net, &res, fl4, skb);
> > > +				nh = &FIB_RES_NH(res);
> > >  				update_or_create_fnhe(nh, fl4->daddr, new_gw,
> > >  						0, false,
> > 
> > nh is assigned value that is never used. Mainline patch removes the
> > assignment (but variable has different type).
> > 
> > 4.19 should delete the assignment, too.
> 
> Ah, good catch, I'll merge this in, thanks.

Thank you!
								Pavel

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