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>

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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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drivers/net/ethernet/mellanox/mlxsw/spectrum.c

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