net: dsa: Discard frames from unused ports
authorAndrew Lunn <andrew@lunn.ch>
Sat, 7 Apr 2018 18:37:40 +0000 (20:37 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 24 Apr 2018 07:36:39 +0000 (09:36 +0200)
commit30593709f80ddf23a3e8b41f3a7edfc68c4786be
tree8025231ce002bff05766db48fbabef1d1ca5e0b6
parent90a32d1f0ec9844b7984f52f07fe7bcb0abfb6a7
net: dsa: Discard frames from unused ports

commit fc5f33768cca7144f8d793205b229d46740d183b upstream.

The Marvell switches under some conditions will pass a frame to the
host with the port being the CPU port. Such frames are invalid, and
should be dropped. Not dropping them can result in a crash when
incrementing the receive statistics for an invalid port.

This has been reworked for 4.14, which does not have the central
dsa_master_find_slave() function, so each tag driver needs to check.

Reported-by: Chris Healy <cphealy@gmail.com>
Fixes: 91da11f870f0 ("net: Distributed Switch Architecture protocol support")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
net/dsa/tag_brcm.c
net/dsa/tag_dsa.c
net/dsa/tag_edsa.c
net/dsa/tag_ksz.c
net/dsa/tag_lan9303.c
net/dsa/tag_mtk.c
net/dsa/tag_qca.c
net/dsa/tag_trailer.c