[PATCH 4.14 216/229] gadgetfs: ep_io - wait until IRQ finishes

From: Greg Kroah-Hartman
Date: Tue Aug 23 2022 - 06:23:55 EST


From: Jozef Martiniak <jomajm@xxxxxxxxx>

[ Upstream commit 04cb742d4d8f30dc2e83b46ac317eec09191c68e ]

after usb_ep_queue() if wait_for_completion_interruptible() is
interrupted we need to wait until IRQ gets finished.

Otherwise complete() from epio_complete() can corrupt stack.

Signed-off-by: Jozef Martiniak <jomajm@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220708070645.6130-1-jomajm@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/usb/gadget/legacy/inode.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index 53d17e1bb65a..f0f41cc8b2f1 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -365,6 +365,7 @@ ep_io (struct ep_data *epdata, void *buf, unsigned len)
spin_unlock_irq (&epdata->dev->lock);

DBG (epdata->dev, "endpoint gone\n");
+ wait_for_completion(&done);
epdata->status = -ENODEV;
}
}
--
2.35.1