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mlxsw: spectrum: Protect driver from buggy firmware

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When processing port up/down events generated by the device's firmware,
the driver protects itself from events reported for non-existent local
ports, but not the CPU port (local port 0), which exists, but lacks a
netdev.

This can result in a NULL pointer dereference when calling
netif_carrier_{on,off}().

Fix this by bailing early when processing an event reported for the CPU
port. Problem was only observed when running on top of a buggy emulator.

Fixes: 28b1987ef5 ("mlxsw: spectrum: Register CPU port with devlink")
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amit Cohen 2021-11-23 09:52:56 +02:00 committed by David S. Miller
parent ce4995bc6c
commit 63b08b1f68
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/mellanox/mlxsw/spectrum.c
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@ -2153,7 +2153,7 @@ static void mlxsw_sp_pude_event_func(const struct mlxsw_reg_info *reg,
max_ports = mlxsw_core_max_ports(mlxsw_sp->core); max_ports = mlxsw_core_max_ports(mlxsw_sp->core);
local_port = mlxsw_reg_pude_local_port_get(pude_pl); local_port = mlxsw_reg_pude_local_port_get(pude_pl);
if (WARN_ON_ONCE(local_port >= max_ports)) if (WARN_ON_ONCE(!local_port || local_port >= max_ports))
return; return;
mlxsw_sp_port = mlxsw_sp->ports[local_port]; mlxsw_sp_port = mlxsw_sp->ports[local_port];
if (!mlxsw_sp_port) if (!mlxsw_sp_port)