linux-kernel - [PATCH 6.7 301/713] wifi: mt76: mt7925e: fix use-after-free in free

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Date: Sun, 24 Mar 2024 18:40:27 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Deren Wu <deren.wu@...iatek.com>,
	Felix Fietkau <nbd@....name>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.7 301/713] wifi: mt76: mt7925e: fix use-after-free in free_irq()

From: Deren Wu <deren.wu@...iatek.com>

[ Upstream commit a5a5f4413d91f395cb2d89829d376d7393ad48b9 ]

>From commit a304e1b82808 ("[PATCH] Debug shared irqs"), there is a test
to make sure the shared irq handler should be able to handle the unexpected
event after deregistration. For this case, let's apply MT76_REMOVED flag to
indicate the device was removed and do not run into the resource access
anymore.

Fixes: c948b5da6bbe ("wifi: mt76: mt7925: add Mediatek Wi-Fi7 driver for mt7925 chips")
Signed-off-by: Deren Wu <deren.wu@...iatek.com>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/mediatek/mt76/mt7925/pci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/pci.c b/drivers/net/wireless/mediatek/mt76/mt7925/pci.c
index c16d683e4891e..bf02a15067ef6 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/pci.c
@@ -427,6 +427,7 @@ static void mt7925_pci_remove(struct pci_dev *pdev)
 	struct mt792x_dev *dev = container_of(mdev, struct mt792x_dev, mt76);
 
 	mt7925e_unregister_device(dev);
+	set_bit(MT76_REMOVED, &mdev->phy.state);
 	devm_free_irq(&pdev->dev, pdev->irq, dev);
 	mt76_free_device(&dev->mt76);
 	pci_free_irq_vectors(pdev);
-- 
2.43.0