netdev - [PATCH net 5/8] net/mlx5: Check for invalid vector index on EQ creation

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Message-ID: <20241015093208.197603-6-tariqt@nvidia.com>
Date: Tue, 15 Oct 2024 12:32:05 +0300
From: Tariq Toukan <tariqt@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>
CC: <netdev@...r.kernel.org>, Saeed Mahameed <saeedm@...dia.com>, Gal Pressman
	<gal@...dia.com>, Leon Romanovsky <leonro@...dia.com>, Maher Sanalla
	<msanalla@...dia.com>, Tariq Toukan <tariqt@...dia.com>
Subject: [PATCH net 5/8] net/mlx5: Check for invalid vector index on EQ creation

From: Maher Sanalla <msanalla@...dia.com>

Currently, mlx5 driver does not enforce vector index to be lower than
the maximum number of supported completion vectors when requesting a
new completion EQ. Thus, mlx5_comp_eqn_get() fails when trying to
acquire an IRQ with an improper vector index.

To prevent the case above, enforce that vector index value is
valid and lower than maximum in mlx5_comp_eqn_get() before handling the
request.

Fixes: f14c1a14e632 ("net/mlx5: Allocate completion EQs dynamically")
Signed-off-by: Maher Sanalla <msanalla@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/eq.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
index 2505f90c0b39..68cb86b37e56 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
@@ -1061,6 +1061,12 @@ int mlx5_comp_eqn_get(struct mlx5_core_dev *dev, u16 vecidx, int *eqn)
 	struct mlx5_eq_comp *eq;
 	int ret = 0;
 
+	if (vecidx >= table->max_comp_eqs) {
+		mlx5_core_dbg(dev, "Requested vector index %u should be less than %u",
+			      vecidx, table->max_comp_eqs);
+		return -EINVAL;
+	}
+
 	mutex_lock(&table->comp_lock);
 	eq = xa_load(&table->comp_eqs, vecidx);
 	if (eq) {
-- 
2.44.0