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From: Saeed Mahameed <saeed@kernel.org>
To: "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>
Cc: netdev@vger.kernel.org, Leon Romanovsky <leonro@nvidia.com>,
	Tariq Toukan <tariqt@nvidia.com>,
	Maxim Mikityanskiy <maximmi@nvidia.com>,
	Saeed Mahameed <saeedm@nvidia.com>
Subject: [net 05/12] net/mlx5e: Destroy page pool after XDP SQ to fix use-after-free
Date: Mon,  9 Aug 2021 20:59:16 -0700	[thread overview]
Message-ID: <20210810035923.345745-6-saeed@kernel.org> (raw)
In-Reply-To: <20210810035923.345745-1-saeed@kernel.org>

From: Maxim Mikityanskiy <maximmi@nvidia.com>

mlx5e_close_xdpsq does the cleanup: it calls mlx5e_free_xdpsq_descs to
free the outstanding descriptors, which relies on
mlx5e_page_release_dynamic and page_pool_release_page. However,
page_pool_destroy is already called by this point, because
mlx5e_close_rq runs before mlx5e_close_xdpsq.

This commit fixes the use-after-free by swapping mlx5e_close_xdpsq and
mlx5e_close_rq.

The commit cited below started calling page_pool_destroy directly from
the driver. Previously, the page pool was destroyed under a call_rcu
from xdp_rxq_info_unreg_mem_model, which would defer the deallocation
until after the XDPSQ is cleaned up.

Fixes: 1da4bbeffe41 ("net: core: page_pool: add user refcnt and reintroduce page_pool_destroy")
Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
 .../net/ethernet/mellanox/mlx5/core/en_main.c | 20 +++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 37c440837945..fd250f7bcd88 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -1891,30 +1891,30 @@ static int mlx5e_open_queues(struct mlx5e_channel *c,
 	if (err)
 		goto err_close_icosq;
 
+	err = mlx5e_open_rxq_rq(c, params, &cparam->rq);
+	if (err)
+		goto err_close_sqs;
+
 	if (c->xdp) {
 		err = mlx5e_open_xdpsq(c, params, &cparam->xdp_sq, NULL,
 				       &c->rq_xdpsq, false);
 		if (err)
-			goto err_close_sqs;
+			goto err_close_rq;
 	}
 
-	err = mlx5e_open_rxq_rq(c, params, &cparam->rq);
-	if (err)
-		goto err_close_xdp_sq;
-
 	err = mlx5e_open_xdpsq(c, params, &cparam->xdp_sq, NULL, &c->xdpsq, true);
 	if (err)
-		goto err_close_rq;
+		goto err_close_xdp_sq;
 
 	return 0;
 
-err_close_rq:
-	mlx5e_close_rq(&c->rq);
-
 err_close_xdp_sq:
 	if (c->xdp)
 		mlx5e_close_xdpsq(&c->rq_xdpsq);
 
+err_close_rq:
+	mlx5e_close_rq(&c->rq);
+
 err_close_sqs:
 	mlx5e_close_sqs(c);
 
@@ -1949,9 +1949,9 @@ static int mlx5e_open_queues(struct mlx5e_channel *c,
 static void mlx5e_close_queues(struct mlx5e_channel *c)
 {
 	mlx5e_close_xdpsq(&c->xdpsq);
-	mlx5e_close_rq(&c->rq);
 	if (c->xdp)
 		mlx5e_close_xdpsq(&c->rq_xdpsq);
+	mlx5e_close_rq(&c->rq);
 	mlx5e_close_sqs(c);
 	mlx5e_close_icosq(&c->icosq);
 	mlx5e_close_icosq(&c->async_icosq);
-- 
2.31.1


  parent reply	other threads:[~2021-08-10  3:59 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-10  3:59 [pull request][net 00/12] mlx5 fixes 2021-08-09 Saeed Mahameed
2021-08-10  3:59 ` [net 01/12] net/mlx5: Don't skip subfunction cleanup in case of error in module init Saeed Mahameed
2021-08-10  8:53   ` patchwork-bot+netdevbpf
2021-08-10  3:59 ` [net 02/12] net/mlx5: DR, Add fail on error check on decap Saeed Mahameed
2021-08-10  3:59 ` [net 03/12] net/mlx5e: Avoid creating tunnel headers for local route Saeed Mahameed
2021-08-10  3:59 ` [net 04/12] net/mlx5: Bridge, fix ageing time Saeed Mahameed
2021-08-10  3:59 ` Saeed Mahameed [this message]
2021-08-10  3:59 ` [net 06/12] net/mlx5: Block switchdev mode while devlink traps are active Saeed Mahameed
2021-08-10  3:59 ` [net 07/12] net/mlx5: Fix order of functions in mlx5_irq_detach_nb() Saeed Mahameed
2021-08-10  3:59 ` [net 08/12] net/mlx5: Set all field of mlx5_irq before inserting it to the xarray Saeed Mahameed
2021-08-10  3:59 ` [net 09/12] net/mlx5: Destroy pool->mutex Saeed Mahameed
2021-08-10  3:59 ` [net 10/12] net/mlx5e: TC, Fix error handling memory leak Saeed Mahameed
2021-08-10  3:59 ` [net 11/12] net/mlx5: Synchronize correct IRQ when destroying CQ Saeed Mahameed
2021-08-10  3:59 ` [net 12/12] net/mlx5: Fix return value from tracer initialization Saeed Mahameed

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