diff options
| author |   Andrew Lunn <andrew@lunn.ch> | 2018-04-07 20:37:40 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-04-08 10:34:49 -0400 |
| commit | fc5f33768cca7144f8d793205b229d46740d183b (patch) | |
| tree | d78a133561ac517c10aae6b2baa1d505388fd6df /net | |
| parent | sctp: do not leak kernel memory to user space (diff) | |
| download | linux-dev-fc5f33768cca7144f8d793205b229d46740d183b.tar.xz linux-dev-fc5f33768cca7144f8d793205b229d46740d183b.zip | |
net: dsa: Discard frames from unused ports
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.
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/dsa/dsa_priv.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h index 70de7895e5b8..053731473c99 100644 --- a/net/dsa/dsa_priv.h +++ b/net/dsa/dsa_priv.h @@ -126,6 +126,7 @@ static inline struct net_device *dsa_master_find_slave(struct net_device *dev, struct dsa_port *cpu_dp = dev->dsa_ptr; struct dsa_switch_tree *dst = cpu_dp->dst; struct dsa_switch *ds; + struct dsa_port *slave_port; if (device < 0 || device >= DSA_MAX_SWITCHES) return NULL; @@ -137,7 +138,12 @@ static inline struct net_device *dsa_master_find_slave(struct net_device *dev, if (port < 0 || port >= ds->num_ports) return NULL; - return ds->ports[port].slave; + slave_port = &ds->ports[port]; + + if (unlikely(slave_port->type != DSA_PORT_TYPE_USER)) + return NULL; + + return slave_port->slave; } /* port.c */ |