[PATCH V1 rdma-next 04/24] net/mlx5: Catch too low max number of EQs

[Yishai Hadas <yishaih@nvidia.com>]

From: Dragos Tatulea <dtatulea@nvidia.com>

get_num_eqs() can return a <= 0 value when an adversarial FW reports
such a value of EQs <= MLX5_MAX_ASYNC_EQS. Return an error in this case.

Reviewed-by: Yishai Hadas <yishaih@nvidia.com>
Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/eq.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
index d11ec263d53c..acef6cd36018 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
@@ -1195,9 +1195,13 @@ static int get_num_eqs(struct mlx5_core_dev *dev)
 int mlx5_eq_table_create(struct mlx5_core_dev *dev)
 {
 	struct mlx5_eq_table *eq_table = dev->priv.eq_table;
-	int err;
+	int err, num_eqs;
+
+	num_eqs = get_num_eqs(dev);
+	if (num_eqs <= 0)
+		return -EINVAL;
 
-	eq_table->max_comp_eqs = get_num_eqs(dev);
+	eq_table->max_comp_eqs = num_eqs;
 	err = create_async_eqs(dev);
 	if (err) {
 		mlx5_core_err(dev, "Failed to create async EQs\n");
-- 
2.18.1