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net/mlx5e: kTLS, Fix napi sync and possible use-after-free 

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: 0419d8c9d8 ("net/mlx5e: kTLS, Add kTLS RX resync support")
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Reviewed-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Tariq Toukan 2020-08-10 15:59:41 +03:00 committed by Saeed Mahameed
parent 8f0bcd19b1
commit 6e8de0b6b4
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_rx.c
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@ -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->rule.work))
/* completion is needed, as the priv_rx in the add flow
* is maintained on the wqe info (wi), not on the socket.