netdev - [net 08/14] net/mlx5e: kTLS, Fix missing error unwind on unsupported cipher type

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Date:   Tue, 14 Mar 2023 10:49:34 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>, Gal Pressman <gal@...dia.com>
Subject: [net 08/14] net/mlx5e: kTLS, Fix missing error unwind on unsupported cipher type

From: Gal Pressman <gal@...dia.com>

Do proper error unwinding when adding an unsupported TX/RX cipher type.
Move the switch case prior to key creation so there's less to unwind,
and change the goto label name to describe the action performed instead
of what failed.

Fixes: 4960c414db35 ("net/mlx5e: Support 256 bit keys with kTLS device offload")
Signed-off-by: Gal Pressman <gal@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 .../mellanox/mlx5/core/en_accel/ktls_rx.c     | 24 ++++++++++---------
 .../mellanox/mlx5/core/en_accel/ktls_tx.c     | 22 +++++++++--------
 2 files changed, 25 insertions(+), 21 deletions(-)

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 4be770443b0c..9b597cb24598 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
@@ -621,15 +621,6 @@ int mlx5e_ktls_add_rx(struct net_device *netdev, struct sock *sk,
 	if (unlikely(!priv_rx))
 		return -ENOMEM;
 
-	dek = mlx5_ktls_create_key(priv->tls->dek_pool, crypto_info);
-	if (IS_ERR(dek)) {
-		err = PTR_ERR(dek);
-		goto err_create_key;
-	}
-	priv_rx->dek = dek;
-
-	INIT_LIST_HEAD(&priv_rx->list);
-	spin_lock_init(&priv_rx->lock);
 	switch (crypto_info->cipher_type) {
 	case TLS_CIPHER_AES_GCM_128:
 		priv_rx->crypto_info.crypto_info_128 =
@@ -642,9 +633,20 @@ int mlx5e_ktls_add_rx(struct net_device *netdev, struct sock *sk,
 	default:
 		WARN_ONCE(1, "Unsupported cipher type %u\n",
 			  crypto_info->cipher_type);
-		return -EOPNOTSUPP;
+		err = -EOPNOTSUPP;
+		goto err_cipher_type;
 	}
 
+	dek = mlx5_ktls_create_key(priv->tls->dek_pool, crypto_info);
+	if (IS_ERR(dek)) {
+		err = PTR_ERR(dek);
+		goto err_cipher_type;
+	}
+	priv_rx->dek = dek;
+
+	INIT_LIST_HEAD(&priv_rx->list);
+	spin_lock_init(&priv_rx->lock);
+
 	rxq = mlx5e_ktls_sk_get_rxq(sk);
 	priv_rx->rxq = rxq;
 	priv_rx->sk = sk;
@@ -677,7 +679,7 @@ int mlx5e_ktls_add_rx(struct net_device *netdev, struct sock *sk,
 	mlx5e_tir_destroy(&priv_rx->tir);
 err_create_tir:
 	mlx5_ktls_destroy_key(priv->tls->dek_pool, priv_rx->dek);
-err_create_key:
+err_cipher_type:
 	kfree(priv_rx);
 	return err;
 }
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c
index 60b3e08a1028..0e4c0a093293 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c
@@ -469,14 +469,6 @@ int mlx5e_ktls_add_tx(struct net_device *netdev, struct sock *sk,
 	if (IS_ERR(priv_tx))
 		return PTR_ERR(priv_tx);
 
-	dek = mlx5_ktls_create_key(priv->tls->dek_pool, crypto_info);
-	if (IS_ERR(dek)) {
-		err = PTR_ERR(dek);
-		goto err_create_key;
-	}
-	priv_tx->dek = dek;
-
-	priv_tx->expected_seq = start_offload_tcp_sn;
 	switch (crypto_info->cipher_type) {
 	case TLS_CIPHER_AES_GCM_128:
 		priv_tx->crypto_info.crypto_info_128 =
@@ -489,8 +481,18 @@ int mlx5e_ktls_add_tx(struct net_device *netdev, struct sock *sk,
 	default:
 		WARN_ONCE(1, "Unsupported cipher type %u\n",
 			  crypto_info->cipher_type);
-		return -EOPNOTSUPP;
+		err = -EOPNOTSUPP;
+		goto err_pool_push;
 	}
+
+	dek = mlx5_ktls_create_key(priv->tls->dek_pool, crypto_info);
+	if (IS_ERR(dek)) {
+		err = PTR_ERR(dek);
+		goto err_pool_push;
+	}
+
+	priv_tx->dek = dek;
+	priv_tx->expected_seq = start_offload_tcp_sn;
 	priv_tx->tx_ctx = tls_offload_ctx_tx(tls_ctx);
 
 	mlx5e_set_ktls_tx_priv_ctx(tls_ctx, priv_tx);
@@ -500,7 +502,7 @@ int mlx5e_ktls_add_tx(struct net_device *netdev, struct sock *sk,
 
 	return 0;
 
-err_create_key:
+err_pool_push:
 	pool_push(pool, priv_tx);
 	return err;
 }
-- 
2.39.2