netdev - [net 3/4] net/mlx5e: Fix null pointer access when setting MTU of vport representor

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Date:   Tue, 31 Jul 2018 13:29:58 -0700
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Adi Nissim <adin@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [net 3/4] net/mlx5e: Fix null pointer access when setting MTU of vport representor

From: Adi Nissim <adin@...lanox.com>

MTU helper function is used by both conventional mlx5e
instances (PF/VF) and the eswitch representors. The representor
shouldn't change the nic vport context MTU, the VF is responsible for
that. Therefore set_mtu_cb has a null value when changing the
representor MTU.

Fixes: 250a42b6a764 ("net/mlx5e: Support configurable MTU for vport representors")
Signed-off-by: Adi Nissim <adin@...lanox.com>
Reviewed-by: Yevgeny Kliteynik <kliteyn@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index dae4156a710d..c592678ab5f1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -3712,7 +3712,8 @@ int mlx5e_change_mtu(struct net_device *netdev, int new_mtu,
 
 	if (!reset) {
 		params->sw_mtu = new_mtu;
-		set_mtu_cb(priv);
+		if (set_mtu_cb)
+			set_mtu_cb(priv);
 		netdev->mtu = params->sw_mtu;
 		goto out;
 	}
-- 
2.17.0