tree 30d01d454c45be34fc8c9430cf75ff7d88fcafd6
parent 9f2972e151dd16d3286c1407bec4e66395f30135
author Florian Fainelli <f.fainelli@gmail.com> 1631828015 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1632306487 +0200

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>