linux-kernel - [PATCH AUTOSEL 5.18 27/56] gadgetfs: ep_io

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Date:   Sun, 14 Aug 2022 11:29:57 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jozef Martiniak <jomajm@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, balbi@...nel.org,
        stern@...land.harvard.edu, axboe@...nel.dk, hbh25y@...il.com,
        rdunlap@...radead.org, mingo@...nel.org, linux-usb@...r.kernel.org
Subject: [PATCH AUTOSEL 5.18 27/56] gadgetfs: ep_io - wait until IRQ finishes

From: Jozef Martiniak <jomajm@...il.com>

[ 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@...il.com>
Link: https://lore.kernel.org/r/20220708070645.6130-1-jomajm@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 0c01e749f9ea..b9d3eed6bec8 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -362,6 +362,7 @@ 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