linux-kernel - [PATCH v1] net/mlx5: Fix null-ptr-deref in mlx5_create_ttc

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Message-Id: <20250405100814.77886-1-bsdhenrymartin@gmail.com>
Date: Sat,  5 Apr 2025 18:08:14 +0800
From: Henry Martin <bsdhenrymartin@...il.com>
To: saeedm@...dia.com,
	leon@...nel.org,
	tariqt@...dia.com
Cc: andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
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	pabeni@...hat.com,
	amirtz@...dia.com,
	ayal@...dia.com,
	bsdhenrymartin@...il.com,
	netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1] net/mlx5:  Fix null-ptr-deref in  mlx5_create_ttc_table()

Add NULL check for mlx5_get_flow_namespace() returns in
mlx5_create_ttc_table() to prevent NULL pointer dereference.

Fixes: 137f3d50ad2a ("net/mlx5: Support matching on l4_type for ttc_table")
Signed-off-by: Henry Martin <bsdhenrymartin@...il.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/lib/fs_ttc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/fs_ttc.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/fs_ttc.c
index eb3bd9c7f66e..4b31b4c953fb 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/fs_ttc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/fs_ttc.c
@@ -728,6 +728,8 @@ struct mlx5_ttc_table *mlx5_create_ttc_table(struct mlx5_core_dev *dev,
 	}
 
 	ns = mlx5_get_flow_namespace(dev, params->ns_type);
+	if (!ns)
+		return ERR_PTR(-EOPNOTSUPP);
 	groups = use_l4_type ? &ttc_groups[TTC_GROUPS_USE_L4_TYPE] :
 			       &ttc_groups[TTC_GROUPS_DEFAULT];
 
-- 
2.34.1