netdev - Re: [PATCH iproute2] ip maddr: fix filtering by device

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Date:   Thu, 19 Oct 2017 11:14:14 +0200
From:   Petr Vorel <pvorel@...e.cz>
To:     Phil Sutter <phil@....cc>, Michal Kubecek <mkubecek@...e.cz>,
        Stephen Hemminger <stephen@...workplumber.org>,
        netdev@...r.kernel.org
Subject: Re: [PATCH iproute2] ip maddr: fix filtering by device

> On Thu, Oct 19, 2017 at 10:21:08AM +0200, Michal Kubecek wrote:
> > Commit 530903dd9003 ("ip: fix igmp parsing when iface is long") uses
> > variable len to keep trailing colon from interface name comparison.  This
> > variable is local to loop body but we set it in one pass and use it in
> > following one(s) so that we are actually using (pseudo)random length for
> > comparison. This became apparent since commit b48a1161f5f9 ("ipmaddr: Avoid
> > accessing uninitialized data") always initializes len to zero so that the
> > name comparison is always true. As a result, "ip maddr show dev eth0" shows
> > IPv4 multicast addresses for all interfaces.

> > Instead of keeping the length, let's simply replace the trailing colon with
> > a null byte. The bonus is that we get correct interface name in ma.name.

> > Fixes: 530903dd9003 ("ip: fix igmp parsing when iface is long")
> > Signed-off-by: Michal Kubecek <mkubecek@...e.cz>

> Acked-by: Phil Sutter <phil@....cc>

Acked-by: Petr Vorel <pvorel@...e.cz>

Thanks for fixing, Michal.
Petr