netdev - [net 14/14] net/mlx5e: Fix possible race condition in macsec extended packet number update routine

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Date:   Mon, 21 Nov 2022 18:25:59 -0800
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>,
        Emeel Hakim <ehakim@...dia.com>
Subject: [net 14/14] net/mlx5e: Fix possible race condition in macsec extended packet number update routine

From: Emeel Hakim <ehakim@...dia.com>

Currenty extended packet number (EPN) update routine is accessing
macsec object without holding the general macsec lock hence facing
a possible race condition when an EPN update occurs while updating
or deleting the SA.
Fix by holding the general macsec lock before accessing the object.

Fixes: 4411a6c0abd3 ("net/mlx5e: Support MACsec offload extended packet number (EPN)")
Signed-off-by: Emeel Hakim <ehakim@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
index 4f96c69c6cc4..3dc6c987b8da 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/macsec.c
@@ -1536,6 +1536,8 @@ static void macsec_async_event(struct work_struct *work)
 
 	async_work = container_of(work, struct mlx5e_macsec_async_work, work);
 	macsec = async_work->macsec;
+	mutex_lock(&macsec->lock);
+
 	mdev = async_work->mdev;
 	obj_id = async_work->obj_id;
 	macsec_sa = get_macsec_tx_sa_from_obj_id(macsec, obj_id);
@@ -1557,6 +1559,7 @@ static void macsec_async_event(struct work_struct *work)
 
 out_async_work:
 	kfree(async_work);
+	mutex_unlock(&macsec->lock);
 }
 
 static int macsec_obj_change_event(struct notifier_block *nb, unsigned long event, void *data)
-- 
2.38.1