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Date:   Mon, 21 Sep 2020 17:30:57 -0700
To:     "David S. Miller" <>,
        Jakub Kicinski <>
Cc:, Tariq Toukan <>,
        Maxim Mikityanskiy <>,
        Saeed Mahameed <>,
        Saeed Mahameed <>
Subject: [net V2 11/15] net/mlx5e: kTLS, Fix napi sync and possible use-after-free

From: Tariq Toukan <>

Using synchronize_rcu() is sufficient to wait until running NAPI quits.

See similar upstream fix with detailed explanation:
("net/mlx5e: Use synchronize_rcu to sync with NAPI")

This change also fixes a possible use-after-free as the NAPI
might be already released at this stage.

Fixes: 0419d8c9d8f8 ("net/mlx5e: kTLS, Add kTLS RX resync support")
Signed-off-by: Tariq Toukan <>
Reviewed-by: Maxim Mikityanskiy <>
Signed-off-by: Saeed Mahameed <>
Signed-off-by: Saeed Mahameed <>
 drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_rx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_rx.c
index acf6d80a6bb7..f95aa50ab51a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_rx.c
@@ -659,7 +659,7 @@ void mlx5e_ktls_del_rx(struct net_device *netdev, struct tls_context *tls_ctx)
 	priv_rx = mlx5e_get_ktls_rx_priv_ctx(tls_ctx);
 	set_bit(MLX5E_PRIV_RX_FLAG_DELETING, priv_rx->flags);
 	mlx5e_set_ktls_rx_priv_ctx(tls_ctx, NULL);
-	napi_synchronize(&priv->channels.c[priv_rx->rxq]->napi);
+	synchronize_rcu(); /* Sync with NAPI */
 	if (!cancel_work_sync(&priv_rx->
 		/* completion is needed, as the priv_rx in the add flow
 		 * is maintained on the wqe info (wi), not on the socket.

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