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Message-Id: <20240108152605.3712050-1-alexious@zju.edu.cn>
Date: Mon, 8 Jan 2024 23:26:04 +0800
From: Zhipeng Lu <alexious@....edu.cn>
To: alexious@....edu.cn
Cc: Simon Horman <horms@...nel.org>,
Saeed Mahameed <saeedm@...dia.com>,
Leon Romanovsky <leon@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Maor Gottlieb <maorg@...lanox.com>,
netdev@...r.kernel.org,
linux-rdma@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] net/mlx5e: fix a double-free in arfs_create_groups
When `in` allocated by kvzalloc fails, arfs_create_groups will free
ft->g and return an error. However, arfs_create_table, the only caller of
arfs_create_groups, will hold this error and call to
mlx5e_destroy_flow_table, in which the ft->g will be freed again.
Fixes: 1cabe6b0965e ("net/mlx5e: Create aRFS flow tables")
Signed-off-by: Zhipeng Lu <alexious@....edu.cn>
Reviewed-by: Simon Horman <horms@...nel.org>
---
Changelog:
v2: free ft->g just in arfs_create_groups with a unwind ladde.
---
.../net/ethernet/mellanox/mlx5/core/en_arfs.c | 17 +++++++++--------
drivers/net/ethernet/mellanox/mlx5/core/en_fs.c | 1 -
2 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c b/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c
index bb7f86c993e5..c96f4c571b63 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c
@@ -252,13 +252,14 @@ static int arfs_create_groups(struct mlx5e_flow_table *ft,
int err;
u8 *mc;
+ ft->num_groups = 0;
+
ft->g = kcalloc(MLX5E_ARFS_NUM_GROUPS,
sizeof(*ft->g), GFP_KERNEL);
in = kvzalloc(inlen, GFP_KERNEL);
if (!in || !ft->g) {
- kfree(ft->g);
- kvfree(in);
- return -ENOMEM;
+ err = -ENOMEM;
+ goto free_ft;
}
mc = MLX5_ADDR_OF(create_flow_group_in, in, match_criteria);
@@ -278,7 +279,7 @@ static int arfs_create_groups(struct mlx5e_flow_table *ft,
break;
default:
err = -EINVAL;
- goto out;
+ goto free_ft;
}
switch (type) {
@@ -300,7 +301,7 @@ static int arfs_create_groups(struct mlx5e_flow_table *ft,
break;
default:
err = -EINVAL;
- goto out;
+ goto free_ft;
}
MLX5_SET_CFG(in, match_criteria_enable, MLX5_MATCH_OUTER_HEADERS);
@@ -327,7 +328,9 @@ static int arfs_create_groups(struct mlx5e_flow_table *ft,
err:
err = PTR_ERR(ft->g[ft->num_groups]);
ft->g[ft->num_groups] = NULL;
-out:
+free_ft:
+ kfree(ft->g);
+ ft->g = NULL;
kvfree(in);
return err;
@@ -343,8 +346,6 @@ static int arfs_create_table(struct mlx5e_flow_steering *fs,
struct mlx5_flow_table_attr ft_attr = {};
int err;
- ft->num_groups = 0;
-
ft_attr.max_fte = MLX5E_ARFS_TABLE_SIZE;
ft_attr.level = MLX5E_ARFS_FT_LEVEL;
ft_attr.prio = MLX5E_NIC_PRIO;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_fs.c b/drivers/net/ethernet/mellanox/mlx5/core/en_fs.c
index 777d311d44ef..7b6aa0c8b58d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_fs.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_fs.c
@@ -883,7 +883,6 @@ void mlx5e_fs_init_l2_addr(struct mlx5e_flow_steering *fs, struct net_device *ne
void mlx5e_destroy_flow_table(struct mlx5e_flow_table *ft)
{
mlx5e_destroy_groups(ft);
- kfree(ft->g);
mlx5_destroy_flow_table(ft->t);
ft->t = NULL;
}
--
2.34.1
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