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From: Yang Yingliang <yangyingliang@huawei.com>
To: <linux-kernel@vger.kernel.org>, <linux-phy@lists.infradead.org>
Cc: <vkoul@kernel.org>, <kishon@ti.com>
Subject: [PATCH -next] phy: phy-twl4030-usb: Fix possible use-after-free in twl4030_usb_remove()
Date: Wed, 7 Apr 2021 17:27:16 +0800	[thread overview]
Message-ID: <20210407092716.3270248-1-yangyingliang@huawei.com> (raw)

This driver's remove path calls cancel_delayed_work(). However, that
function does not wait until the work function finishes. This means
that the callback function may still be running after the driver's
remove function has finished, which would result in a use-after-free.

Fix by calling cancel_delayed_work_sync(), which ensures that
the work is properly cancelled, no longer running, and unable
to re-schedule itself.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 drivers/phy/ti/phy-twl4030-usb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/phy/ti/phy-twl4030-usb.c b/drivers/phy/ti/phy-twl4030-usb.c
index 9887f908f540..812e5409d359 100644
--- a/drivers/phy/ti/phy-twl4030-usb.c
+++ b/drivers/phy/ti/phy-twl4030-usb.c
@@ -779,7 +779,7 @@ static int twl4030_usb_remove(struct platform_device *pdev)
 
 	usb_remove_phy(&twl->phy);
 	pm_runtime_get_sync(twl->dev);
-	cancel_delayed_work(&twl->id_workaround_work);
+	cancel_delayed_work_sync(&twl->id_workaround_work);
 	device_remove_file(twl->dev, &dev_attr_vbus);
 
 	/* set transceiver mode to power on defaults */
-- 
2.25.1


WARNING: multiple messages have this Message-ID (diff)
From: Yang Yingliang <yangyingliang@huawei.com>
To: <linux-kernel@vger.kernel.org>, <linux-phy@lists.infradead.org>
Cc: <vkoul@kernel.org>, <kishon@ti.com>
Subject: [PATCH -next] phy: phy-twl4030-usb: Fix possible use-after-free in twl4030_usb_remove()
Date: Wed, 7 Apr 2021 17:27:16 +0800	[thread overview]
Message-ID: <20210407092716.3270248-1-yangyingliang@huawei.com> (raw)

This driver's remove path calls cancel_delayed_work(). However, that
function does not wait until the work function finishes. This means
that the callback function may still be running after the driver's
remove function has finished, which would result in a use-after-free.

Fix by calling cancel_delayed_work_sync(), which ensures that
the work is properly cancelled, no longer running, and unable
to re-schedule itself.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 drivers/phy/ti/phy-twl4030-usb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/phy/ti/phy-twl4030-usb.c b/drivers/phy/ti/phy-twl4030-usb.c
index 9887f908f540..812e5409d359 100644
--- a/drivers/phy/ti/phy-twl4030-usb.c
+++ b/drivers/phy/ti/phy-twl4030-usb.c
@@ -779,7 +779,7 @@ static int twl4030_usb_remove(struct platform_device *pdev)
 
 	usb_remove_phy(&twl->phy);
 	pm_runtime_get_sync(twl->dev);
-	cancel_delayed_work(&twl->id_workaround_work);
+	cancel_delayed_work_sync(&twl->id_workaround_work);
 	device_remove_file(twl->dev, &dev_attr_vbus);
 
 	/* set transceiver mode to power on defaults */
-- 
2.25.1


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             reply	other threads:[~2021-04-07  9:24 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-07  9:27 Yang Yingliang [this message]
2021-04-07  9:27 ` [PATCH -next] phy: phy-twl4030-usb: Fix possible use-after-free in twl4030_usb_remove() Yang Yingliang
2021-04-12  5:05 ` Vinod Koul
2021-04-12  5:05   ` Vinod Koul

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