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usb: gadget: tegra-xudc: Fix possible use-after-free in tegra_xudc_remove()

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[ Upstream commit a932ee40c2 ]

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>
Link: https://lore.kernel.org/r/20210407092947.3271507-1-yangyingliang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yang Yingliang 2021-04-07 17:29:47 +08:00 • committed by Greg Kroah-Hartman
commit 015f3f2521
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/gadget/udc/tegra-xudc.c
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@ -3883,7 +3883,7 @@ static int tegra_xudc_remove(struct platform_device *pdev)
pm_runtime_get_sync(xudc->dev);
cancel_delayed_work(&xudc->plc_reset_work);
cancel_delayed_work_sync(&xudc->plc_reset_work);
cancel_work_sync(&xudc->usb_role_sw_work);
usb_del_gadget_udc(&xudc->gadget);