linux-kernel - [PATCH] net/mlx5: Fix memory leak in mlx5_sf_dev

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Date:   Thu, 26 May 2022 16:44:11 +0800
From:   Jianglei Nie <niejianglei2021@....com>
To:     saeedm@...dia.com, leon@...nel.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        parav@...dia.com, vuhuong@...dia.com, shayd@...dia.com
Cc:     netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jianglei Nie <niejianglei2021@....com>
Subject: [PATCH] net/mlx5: Fix memory leak in mlx5_sf_dev_add()

The variable id is allocated by mlx5_adev_idx_alloc(). When some error
happens, the id should be freed by mlx5_adev_idx_free().But when
auxiliary_device_add() and xa_insert() fail, the id is not freed,which
will lead to a potential memory leak.

We can fix it by calling mlx5_sf_dev_add() when auxiliary_device_add()
and xa_insert() fail.

Signed-off-by: Jianglei Nie <niejianglei2021@....com>
---
 drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.c b/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.c
index 7da012ff0d41..9f222061a1c0 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/dev.c
@@ -125,13 +125,16 @@ static void mlx5_sf_dev_add(struct mlx5_core_dev *dev, u16 sf_index, u16 fn_id,
 
 	err = auxiliary_device_add(&sf_dev->adev);
 	if (err) {
+		mlx5_adev_idx_free(id);
 		put_device(&sf_dev->adev.dev);
 		goto add_err;
 	}
 
 	err = xa_insert(&table->devices, sf_index, sf_dev, GFP_KERNEL);
-	if (err)
+	if (err) {
+		mlx5_adev_idx_free(id);
 		goto xa_err;
+	}
 	return;
 
 xa_err:
-- 
2.25.1