linux-kernel - [PATCH 5.10 351/563] net-sysfs: update the queue counts in the unregistration path

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Date:   Mon, 24 Jan 2022 19:41:56 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Antoine Tenart <atenart@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 351/563] net-sysfs: update the queue counts in the unregistration path

From: Antoine Tenart <atenart@...nel.org>

[ Upstream commit d7dac083414eb5bb99a6d2ed53dc2c1b405224e5 ]

When updating Rx and Tx queue kobjects, the queue count should always be
updated to match the queue kobjects count. This was not done in the net
device unregistration path, fix it. Tracking all queue count updates
will allow in a following up patch to detect illegal updates.

Signed-off-by: Antoine Tenart <atenart@...nel.org>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/core/net-sysfs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index af59123601055..99303897b7bb7 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -1804,6 +1804,9 @@ static void remove_queue_kobjects(struct net_device *dev)
 
 	net_rx_queue_update_kobjects(dev, real_rx, 0);
 	netdev_queue_update_kobjects(dev, real_tx, 0);
+
+	dev->real_num_rx_queues = 0;
+	dev->real_num_tx_queues = 0;
 #ifdef CONFIG_SYSFS
 	kset_unregister(dev->queues_kset);
 #endif
-- 
2.34.1