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From:   Dinghao Liu <dinghao.liu@zju.edu.cn>
To:     dinghao.liu@zju.edu.cn
Cc:     Saeed Mahameed <saeedm@nvidia.com>,
        Leon Romanovsky <leon@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Zhengchao Shao <shaozhengchao@huawei.com>,
        Rahul Rameshbabu <rrameshbabu@nvidia.com>,
        Simon Horman <horms@kernel.org>,
        Tariq Toukan <tariqt@nvidia.com>, Aya Levin <ayal@nvidia.com>,
        netdev@vger.kernel.org, linux-rdma@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH] net/mlx5e: fix a potential double-free in fs_any_create_groups
Date:   Tue, 28 Nov 2023 16:28:09 +0800
Message-Id: <20231128082812.24483-1-dinghao.liu@zju.edu.cn>
Precedence: bulk

When kcalloc() for ft->g succeeds but kvzalloc() for in fails,
fs_any_create_groups() will free ft->g. However, its caller
fs_any_create_table() will free ft->g again through calling
mlx5e_destroy_flow_table(), which will lead to a double-free.
Fix this by removing the kfree(ft->g) in fs_any_create_groups().

Fixes: 0f575c20bf06 ("net/mlx5e: Introduce Flow Steering ANY API")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c b/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
index be83ad9db82a..b222d23bfb9a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
@@ -434,7 +434,6 @@ static int fs_any_create_groups(struct mlx5e_flow_table *ft)
 	ft->g = kcalloc(MLX5E_FS_UDP_NUM_GROUPS, sizeof(*ft->g), GFP_KERNEL);
 	in = kvzalloc(inlen, GFP_KERNEL);
 	if  (!in || !ft->g) {
-		kfree(ft->g);
 		kvfree(in);
 		return -ENOMEM;
 	}
-- 
2.17.1