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From: Zhipeng Lu <alexious@zju.edu.cn>
To: alexious@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>,
	Maor Gottlieb <maorg@mellanox.com>,
	netdev@vger.kernel.org,
	linux-rdma@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] net/mlx5e: fix a double-free in arfs_create_groups
Date: Sun, 24 Dec 2023 16:13:48 +0800
Message-Id: <20231224081348.3535146-1-alexious@zju.edu.cn>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

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@zju.edu.cn>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c b/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c
index bb7f86c993e5..d9a60bd04167 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_arfs.c
@@ -257,6 +257,7 @@ static int arfs_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