netdev - [PATCH net] sfc: support for devlink port requires MAE access

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Date:   Wed, 28 Jun 2023 13:32:20 +0100
From:   Martin Habets <habetsm.xilinx@...il.com>
To:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com
Cc:     netdev@...r.kernel.org, ecree.xilinx@...il.com,
        linux-net-drivers@....com
Subject: [PATCH net] sfc: support for devlink port requires MAE access

On systems without MAE permission efx->mae is not initialised,
and trying to lookup an mport results in a NULL pointer
dereference.

Fixes: 25414b2a64ae ("sfc: add devlink port support for ef100")
Signed-off-by: Martin Habets <habetsm.xilinx@...il.com>
---
 drivers/net/ethernet/sfc/efx_devlink.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/sfc/efx_devlink.c b/drivers/net/ethernet/sfc/efx_devlink.c
index ef9971cbb695..0384b134e124 100644
--- a/drivers/net/ethernet/sfc/efx_devlink.c
+++ b/drivers/net/ethernet/sfc/efx_devlink.c
@@ -622,6 +622,9 @@ static struct devlink_port *ef100_set_devlink_port(struct efx_nic *efx, u32 idx)
 	u32 id;
 	int rc;
 
+	if (!efx->mae)
+		return NULL;
+
 	if (efx_mae_lookup_mport(efx, idx, &id)) {
 		/* This should not happen. */
 		if (idx == MAE_MPORT_DESC_VF_IDX_NULL)