linux-kernel - [PATCH] net/mlx5e: Fix two double free cases

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Date:   Mon, 21 Dec 2020 16:50:31 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] net/mlx5e: Fix two double free cases

mlx5e_create_ttc_table_groups() frees ft->g on failure of
kvzalloc(), but such failure will be caught by its caller
in mlx5e_create_ttc_table() and ft->g will be freed again
in mlx5e_destroy_flow_table(). The same issue also occurs
in mlx5e_create_ttc_table_groups().

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_fs.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_fs.c b/drivers/net/ethernet/mellanox/mlx5/core/en_fs.c
index fa8149f6eb08..63323c5b6a50 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_fs.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_fs.c
@@ -940,10 +940,8 @@ static int mlx5e_create_ttc_table_groups(struct mlx5e_ttc_table *ttc,
 	if (!ft->g)
 		return -ENOMEM;
 	in = kvzalloc(inlen, GFP_KERNEL);
-	if (!in) {
-		kfree(ft->g);
+	if (!in)
 		return -ENOMEM;
-	}
 
 	/* L4 Group */
 	mc = MLX5_ADDR_OF(create_flow_group_in, in, match_criteria);
@@ -1085,10 +1083,8 @@ static int mlx5e_create_inner_ttc_table_groups(struct mlx5e_ttc_table *ttc)
 	if (!ft->g)
 		return -ENOMEM;
 	in = kvzalloc(inlen, GFP_KERNEL);
-	if (!in) {
-		kfree(ft->g);
+	if (!in)
 		return -ENOMEM;
-	}
 
 	/* L4 Group */
 	mc = MLX5_ADDR_OF(create_flow_group_in, in, match_criteria);
-- 
2.17.1