linux-kernel - [PATCH net] net/mlx5: Fix tainted pointer delete is case of flow rules creation fail

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Message-ID: <20240604100552.25201-1-amishin@t-argos.ru>
Date: Tue, 4 Jun 2024 13:05:52 +0300
From: Aleksandr Mishin <amishin@...rgos.ru>
To: Mark Bloch <mbloch@...dia.com>
CC: Aleksandr Mishin <amishin@...rgos.ru>, Saeed Mahameed <saeedm@...dia.com>,
	Leon Romanovsky <leon@...nel.org>, Tariq Toukan <tariqt@...dia.com>, "David
 S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub
 Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Maor Gottlieb
	<maorg@...dia.com>, Jacob Keller <jacob.e.keller@...el.com>, Shay Drory
	<shayd@...dia.com>, Jianbo Liu <jianbol@...dia.com>, Jinjie Ruan
	<ruanjinjie@...wei.com>, <netdev@...r.kernel.org>,
	<linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<lvc-project@...uxtesting.org>
Subject: [PATCH net] net/mlx5: Fix tainted pointer delete is case of flow rules creation fail

In case of flow rule creation fail in mlx5_lag_create_port_sel_table(),
instead of previously created rules, the tainted pointer is deleted
deveral times.
Fix this bug by using correct flow rules pointers.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 352899f384d4 ("net/mlx5: Lag, use buckets in hash mode")
Signed-off-by: Aleksandr Mishin <amishin@...rgos.ru>
---
 drivers/net/ethernet/mellanox/mlx5/core/lag/port_sel.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lag/port_sel.c b/drivers/net/ethernet/mellanox/mlx5/core/lag/port_sel.c
index c16b462ddedf..ab2717012b79 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lag/port_sel.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lag/port_sel.c
@@ -88,9 +88,13 @@ static int mlx5_lag_create_port_sel_table(struct mlx5_lag *ldev,
 								      &dest, 1);
 			if (IS_ERR(lag_definer->rules[idx])) {
 				err = PTR_ERR(lag_definer->rules[idx]);
-				while (i--)
-					while (j--)
+				do {
+					while (j--) {
+						idx = i * ldev->buckets + j;
 						mlx5_del_flow_rules(lag_definer->rules[idx]);
+					}
+					j = ldev->buckets;
+				} while (i--);
 				goto destroy_fg;
 			}
 		}
-- 
2.30.2