linux-kernel - [PATCH net] net/mlx5: Fix error handling in mlx5_init_one

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Date: Thu, 9 May 2024 14:00:18 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Shay Drory <shayd@...dia.com>
Cc: Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
	Tariq Toukan <tariqt@...dia.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Moshe Shemesh <moshe@...dia.com>, netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH net] net/mlx5: Fix error handling in mlx5_init_one_light()

If mlx5_query_hca_caps_light() fails then calling devl_unregister() or
devl_unlock() is a bug.  It's not registered and it's not locked.  That
will trigger a stack trace in this case because devl_unregister() checks
both those things at the start of the function.

If mlx5_devlink_params_register() fails then this code will call
devl_unregister() and devl_unlock() twice which will again lead to a
stack trace or possibly something worse as well.

Fixes: bf729988303a ("net/mlx5: Restore mistakenly dropped parts in register devlink flow")
Fixes: c6e77aa9dd82 ("net/mlx5: Register devlink first under devlink lock")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/main.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 331ce47f51a1..105c98160327 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -1690,7 +1690,7 @@ int mlx5_init_one_light(struct mlx5_core_dev *dev)
 	err = mlx5_query_hca_caps_light(dev);
 	if (err) {
 		mlx5_core_warn(dev, "mlx5_query_hca_caps_light err=%d\n", err);
-		goto query_hca_caps_err;
+		goto err_function_disable;
 	}
 
 	devl_lock(devlink);
@@ -1699,18 +1699,16 @@ int mlx5_init_one_light(struct mlx5_core_dev *dev)
 	err = mlx5_devlink_params_register(priv_to_devlink(dev));
 	if (err) {
 		mlx5_core_warn(dev, "mlx5_devlink_param_reg err = %d\n", err);
-		goto params_reg_err;
+		goto err_unregister;
 	}
 
 	devl_unlock(devlink);
 	return 0;
 
-params_reg_err:
-	devl_unregister(devlink);
-	devl_unlock(devlink);
-query_hca_caps_err:
+err_unregister:
 	devl_unregister(devlink);
 	devl_unlock(devlink);
+err_function_disable:
 	mlx5_function_disable(dev, true);
 out:
 	dev->state = MLX5_DEVICE_STATE_INTERNAL_ERROR;
-- 
2.43.0