linux-kernel - [PATCH] [v2] net/mlx5e: fix a potential double-free in fs_any_create

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Message-Id: <20231128092904.2916-1-dinghao.liu@zju.edu.cn>
Date:   Tue, 28 Nov 2023 17:29:01 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn
Cc:     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>,
        Rahul Rameshbabu <rrameshbabu@...dia.com>,
        Zhengchao Shao <shaozhengchao@...wei.com>,
        Simon Horman <horms@...nel.org>, Aya Levin <ayal@...dia.com>,
        Tariq Toukan <tariqt@...dia.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] net/mlx5e: fix a potential double-free in fs_any_create_groups

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 setting ft->g to NULL in fs_any_create_groups().

Fixes: 0f575c20bf06 ("net/mlx5e: Introduce Flow Steering ANY API")
Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---

Changelog:

v2: Setting ft->g to NULL instead of removing the kfree().
---
 drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c | 1 +
 1 file changed, 1 insertion(+)

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..6207ffe74233 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
@@ -435,6 +435,7 @@ static int fs_any_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;
 	}
-- 
2.17.1