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From: Suanming Mou <suanmingm@mellanox.com>
To: Matan Azrad <matan@mellanox.com>,
	Shahaf Shuler <shahafs@mellanox.com>,
	Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Cc: dev@dpdk.org, rasland@mellanox.com, stable@dpdk.org
Subject: [dpdk-stable] [PATCH] net/mlx5: fix potential null dereference in port close
Date: Fri, 15 May 2020 16:42:09 +0800
Message-ID: <1589532130-321429-1-git-send-email-suanmingm@mellanox.com> (raw)

The mlx5_dev_close() might be called twice and the priv->sh is NULL on
the second pass.
The DRV_LOG does not check priv->sh and it causes potential NULL
dereference.

Check priv->sh before priv->sh->ctx to avoid the potential NULL
dereference."

Fixes: 942d13e6e7d1 ("net/mlx5: fix sharing context destroy order")
Cc: stable@dpdk.org

Signed-off-by: Suanming Mou <suanmingm@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
---
 drivers/net/mlx5/mlx5.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index 1445809..be16841 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -1425,7 +1425,8 @@ struct mlx5_flow_id_pool *
 
 	DRV_LOG(DEBUG, "port %u closing device \"%s\"",
 		dev->data->port_id,
-		((priv->sh->ctx != NULL) ? priv->sh->ctx->device->name : ""));
+		((priv->sh && priv->sh->ctx) ?
+		priv->sh->ctx->device->name : ""));
 	/* In case mlx5_dev_stop() has not been called. */
 	mlx5_dev_interrupt_handler_uninstall(dev);
 	mlx5_dev_interrupt_handler_devx_uninstall(dev);
-- 
1.8.3.1


             reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-15  8:42 Suanming Mou [this message]
2020-05-28  6:59 ` [dpdk-stable] [PATCH v2] net/mlx5: fix secondary process resources release Suanming Mou
2020-05-31 14:03   ` Raslan Darawsheh

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