netdev - [PATCH net] net/mlx5e: fix double free in mlx5e_destroy_flow

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Date: Wed, 28 Jun 2023 08:59:34 +0800
From: Zhengchao Shao <shaozhengchao@...wei.com>
To: <netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>
CC: <borisp@...dia.com>, <saeedm@...dia.com>, <leon@...nel.org>,
	<tariqt@...dia.com>, <lkayal@...dia.com>, <yuehaibing@...wei.com>,
	<shaozhengchao@...wei.com>
Subject: [PATCH net] net/mlx5e: fix double free in mlx5e_destroy_flow_table

In function accel_fs_tcp_create_groups(), when the ft->g memory is
successfully allocated but the 'in' memory fails to be allocated, the
memory pointed to by ft->g is released once. And in function
accel_fs_tcp_create_table, mlx5e_destroy_flow_table is called to release
the memory pointed to by ft->g again. This will cause double free problem.

Fixes: c062d52ac24c ("net/mlx5e: Receive flow steering framework for accelerated TCP flows")
Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c
index 88a5aed9d678..c7d191f66ad1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/fs_tcp.c
@@ -190,6 +190,7 @@ static int accel_fs_tcp_create_groups(struct mlx5e_flow_table *ft,
 	in = kvzalloc(inlen, GFP_KERNEL);
 	if  (!in || !ft->g) {
 		kfree(ft->g);
+		ft->g = NULL;
 		kvfree(in);
 		return -ENOMEM;
 	}
-- 
2.34.1