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Message-ID: <20210407092716.3270248-1-yangyingliang@huawei.com> Date: Wed, 7 Apr 2021 17:27:16 +0800 From: Yang Yingliang <yangyingliang@...wei.com> To: <linux-kernel@...r.kernel.org>, <linux-phy@...ts.infradead.org> CC: <vkoul@...nel.org>, <kishon@...com> Subject: [PATCH -next] phy: phy-twl4030-usb: Fix possible use-after-free in twl4030_usb_remove() 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@...wei.com> Signed-off-by: Yang Yingliang <yangyingliang@...wei.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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