net: dsa: bcm_sf2: Fix array overrun in bcm_sf2_num_active_ports()
commit 02319bf15acf54004216e40ac9c171437f24be24 upstream.
After d12e1c464988 ("net: dsa: b53: Set correct number of ports in the
DSA struct") we stopped setting dsa_switch::num_ports to DSA_MAX_PORTS,
which created an off by one error between the statically allocated
bcm_sf2_priv::port_sts array (of size DSA_MAX_PORTS). When
dsa_is_cpu_port() is used, we end-up accessing an out of bounds member
and causing a NPD.
Fix this by iterating with the appropriate port count using
ds->num_ports.
Fixes: d12e1c464988 ("net: dsa: b53: Set correct number of ports in the DSA struct")
Signed-off-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>
diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 5103249..690e9d9 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -38,7 +38,7 @@
struct bcm_sf2_priv *priv = bcm_sf2_to_priv(ds);
unsigned int port, count = 0;
- for (port = 0; port < ARRAY_SIZE(priv->port_sts); port++) {
+ for (port = 0; port < ds->num_ports; port++) {
if (dsa_is_cpu_port(ds, port))
continue;
if (priv->port_sts[port].enabled)
