This is a note to let you know that I've just added the patch titled
usb: gadget: tegra-xudc: Fix possible use-after-free in tegra_xudc_remove()
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-gadget-tegra-xudc-fix-possible-use-after-free-in.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 9cde226b91e4bfc88eef3eb8a8ce8cdfed540327
Author: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Date: Wed Apr 7 17:29:47 2021 +0800
usb: gadget: tegra-xudc: Fix possible use-after-free in tegra_xudc_remove()
[ Upstream commit a932ee40c276767cd55fadec9e38829bf441db41 ]
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@xxxxxxxxxx>
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210407092947.3271507-1-yangyingliang@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/usb/gadget/udc/tegra-xudc.c b/drivers/usb/gadget/udc/tegra-xudc.c
index 580bef8eb4cb..2319c9737c2b 100644
--- a/drivers/usb/gadget/udc/tegra-xudc.c
+++ b/drivers/usb/gadget/udc/tegra-xudc.c
@@ -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);
