linux-kernel - [PATCH] net: mlx5: Add a missing check on idr

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Message-Id: <20190318221924.7034-1-pakki001@umn.edu>
Date:   Mon, 18 Mar 2019 17:18:51 -0500
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Boris Pismenny <borisp@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Ilya Lesokhin <ilyal@...lanox.com>,
        Wei Yongjun <weiyongjun1@...wei.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] net: mlx5: Add a missing check on idr_find

idr_find() can return a NULL value to 'flow' which is used without a check.
The patch adds a check to avoid potential NULL pointer dereference.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 drivers/net/ethernet/mellanox/mlx5/core/fpga/tls.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fpga/tls.c b/drivers/net/ethernet/mellanox/mlx5/core/fpga/tls.c
index 5cf5f2a9d51f..3df468acdffc 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fpga/tls.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fpga/tls.c
@@ -226,6 +226,8 @@ int mlx5_fpga_tls_resync_rx(struct mlx5_core_dev *mdev, u32 handle, u32 seq,
 	rcu_read_lock();
 	flow = idr_find(&mdev->fpga->tls->rx_idr, ntohl(handle));
 	rcu_read_unlock();
+	if (!flow)
+		return -EINVAL;
 	mlx5_fpga_tls_flow_to_cmd(flow, cmd);
 
 	MLX5_SET(tls_cmd, cmd, swid, ntohl(handle));
-- 
2.17.1