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Date: Wed, 06 May 2020 17:32:34 -0700 (PDT) From: David Miller <davem@...emloft.net> To: f.fainelli@...il.com Cc: netdev@...r.kernel.org, allen.pais@...cle.com, andrew@...n.ch, vivien.didelot@...il.com, kuba@...nel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH net] net: dsa: Do not leave DSA master with NULL netdev_ops From: Florian Fainelli <f.fainelli@...il.com> Date: Mon, 4 May 2020 13:18:06 -0700 > When ndo_get_phys_port_name() for the CPU port was added we introduced > an early check for when the DSA master network device in > dsa_master_ndo_setup() already implements ndo_get_phys_port_name(). When > we perform the teardown operation in dsa_master_ndo_teardown() we would > not be checking that cpu_dp->orig_ndo_ops was successfully allocated and > non-NULL initialized. > > With network device drivers such as virtio_net, this leads to a NPD as > soon as the DSA switch hanging off of it gets torn down because we are > now assigning the virtio_net device's netdev_ops a NULL pointer. > > Fixes: da7b9e9b00d4 ("net: dsa: Add ndo_get_phys_port_name() for CPU port") > Reported-by: Allen Pais <allen.pais@...cle.com> > Signed-off-by: Florian Fainelli <f.fainelli@...il.com> Applied and queued up for -stable, thanks Florian.
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