On 21/05/2025 16:36, Wentao Liang wrote:

The function mlx5_query_nic_vport_qkey_viol_cntr() calls the function mlx5_query_nic_vport_context() but does not check its return value. This could lead to undefined behavior if the query fails. A proper implementation can be found in mlx5_nic_vport_query_local_lb().

Add error handling for mlx5_query_nic_vport_context(). If it fails, free the out buffer via kvfree() and return error code.

Fixes: 9efa75254593 ("net/mlx5_core: Introduce access functions to query vport RoCE fields") Cc: stable@vger.kernel.org # v4.5 Target: net Signed-off-by: Wentao Liang vulab@iscas.ac.cn

---

v3: Explicitly mention target branch. Change improper code. v2: Remove redundant reassignment. Fix RCT.

drivers/net/ethernet/mellanox/mlx5/core/vport.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/vport.c b/drivers/net/ethernet/mellanox/mlx5/core/vport.c index 66e44905c1f0..e4b86633d2fe 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/vport.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/vport.c @@ -522,19 +522,22 @@ int mlx5_query_nic_vport_qkey_viol_cntr(struct mlx5_core_dev *mdev, { u32 *out; int outlen = MLX5_ST_SZ_BYTES(query_nic_vport_context_out);

• int err;

out = kvzalloc(outlen, GFP_KERNEL); if (!out) return -ENOMEM;

• mlx5_query_nic_vport_context(mdev, 0, out);

• err = mlx5_query_nic_vport_context(mdev, 0, out);
• if (err)

• goto out;
  

*qkey_viol_cntr = MLX5_GET(query_nic_vport_context_out, out, nic_vport_context.qkey_violation_counter);

+out: kvfree(out);

• return 0;

• return err; } EXPORT_SYMBOL_GPL(mlx5_query_nic_vport_qkey_viol_cntr);

Reviewed-by: Tariq Toukan tariqt@nvidia.com

Thanks.