6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Horatiu Vultur horatiu.vultur@microchip.com
[ Upstream commit 15faa1f67ab405d47789d4702f587ec7df7ef03e ]
There is a crash when adding one of the lan966x interfaces under a lag interface. The issue can be reproduced like this: ip link add name bond0 type bond miimon 100 mode balance-xor ip link set dev eth0 master bond0
The reason is because when adding a interface under the lag it would go through all the ports and try to figure out which other ports are under that lag interface. And the issue is that lan966x can have ports that are NULL pointer as they are not probed. So then iterating over these ports it would just crash as they are NULL pointers. The fix consists in actually checking for NULL pointers before accessing something from the ports. Like we do in other places.
Fixes: cabc9d49333d ("net: lan966x: Add lag support for lan966x") Signed-off-by: Horatiu Vultur horatiu.vultur@microchip.com Reviewed-by: Michal Swiatkowski michal.swiatkowski@linux.intel.com Reviewed-by: Simon Horman horms@kernel.org Link: https://lore.kernel.org/r/20240206123054.3052966-1-horatiu.vultur@microchip.... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/microchip/lan966x/lan966x_lag.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c b/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c index 41fa2523d91d..5f2cd9a8cf8f 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c @@ -37,19 +37,24 @@ static void lan966x_lag_set_aggr_pgids(struct lan966x *lan966x)
/* Now, set PGIDs for each active LAG */ for (lag = 0; lag < lan966x->num_phys_ports; ++lag) { - struct net_device *bond = lan966x->ports[lag]->bond; + struct lan966x_port *port = lan966x->ports[lag]; int num_active_ports = 0; + struct net_device *bond; unsigned long bond_mask; u8 aggr_idx[16];
- if (!bond || (visited & BIT(lag))) + if (!port || !port->bond || (visited & BIT(lag))) continue;
+ bond = port->bond; bond_mask = lan966x_lag_get_mask(lan966x, bond);
for_each_set_bit(p, &bond_mask, lan966x->num_phys_ports) { struct lan966x_port *port = lan966x->ports[p];
+ if (!port) + continue; + lan_wr(ANA_PGID_PGID_SET(bond_mask), lan966x, ANA_PGID(p)); if (port->lag_tx_active)