gadgetfs: ep_io - wait until IRQ finishes

BugLink: https://bugs.launchpad.net/bugs/1990564
[ 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@gmail.com>
Link: https://lore.kernel.org/r/20220708070645.6130-1-jomajm@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index 3279b4767424c4f0737ac77338eb58bcbac7f304..9e8b678f0548e754b0ebdf3380d63cdf67cf01ed 100644 (file)
--- 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;
                        }
                }