From: Eugenia Emantayev <eugenia@mellanox.com>
Date: Tue, 8 Jul 2014 08:25:21 +0000 (+0300)
Subject: net/mlx4: Verify port number in __mlx4_unregister_mac
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=143b3efb402d11f64639d5729634825c3934fc4c;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

net/mlx4: Verify port number in __mlx4_unregister_mac

Verify port number to avoid crashes if port number is outside the range.

Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Eugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/mellanox/mlx4/port.c b/drivers/net/ethernet/mellanox/mlx4/port.c
index 5d76a60ac053..9ba0c1ca10d5 100644
--- a/drivers/net/ethernet/mellanox/mlx4/port.c
+++ b/drivers/net/ethernet/mellanox/mlx4/port.c
@@ -244,10 +244,16 @@ EXPORT_SYMBOL_GPL(mlx4_get_base_qpn);
 
 void __mlx4_unregister_mac(struct mlx4_dev *dev, u8 port, u64 mac)
 {
-	struct mlx4_port_info *info = &mlx4_priv(dev)->port[port];
-	struct mlx4_mac_table *table = &info->mac_table;
+	struct mlx4_port_info *info;
+	struct mlx4_mac_table *table;
 	int index;
 
+	if (port < 1 || port > dev->caps.num_ports) {
+		mlx4_warn(dev, "invalid port number (%d), aborting...\n", port);
+		return;
+	}
+	info = &mlx4_priv(dev)->port[port];
+	table = &info->mac_table;
 	mutex_lock(&table->mutex);
 	index = find_index(dev, table, mac);