linux-kernel - [PATCH AUTOSEL 4.4 06/21] usb: gadget: net2272: Fix net2272

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Message-Id: <20190422194941.13433-6-sashal@kernel.org>
Date:   Mon, 22 Apr 2019 15:49:26 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Guido Kiener <guido@...ner-muenchen.de>,
        Guido Kiener <guido.kiener@...de-schwarz.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Sasha Levin <sashal@...nel.org>, linux-usb@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 06/21] usb: gadget: net2272: Fix net2272_dequeue()

From: Guido Kiener <guido@...ner-muenchen.de>

[ Upstream commit 091dacc3cc10979ab0422f0a9f7fcc27eee97e69 ]

Restore the status of ep->stopped in function net2272_dequeue().

When the given request is not found in the endpoint queue
the function returns -EINVAL without restoring the state of
ep->stopped. Thus the endpoint keeps blocked and does not transfer
any data anymore.

This fix is only compile-tested, since we do not have a
corresponding hardware. An analogous fix was tested in the sibling
driver. See "usb: gadget: net2280: Fix net2280_dequeue()"

Acked-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Guido Kiener <guido.kiener@...de-schwarz.com>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Sasha Levin (Microsoft) <sashal@...nel.org>
---
 drivers/usb/gadget/udc/net2272.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/gadget/udc/net2272.c b/drivers/usb/gadget/udc/net2272.c
index 3b6e34fc032b..553922c3be85 100644
--- a/drivers/usb/gadget/udc/net2272.c
+++ b/drivers/usb/gadget/udc/net2272.c
@@ -962,6 +962,7 @@ net2272_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 			break;
 	}
 	if (&req->req != _req) {
+		ep->stopped = stopped;
 		spin_unlock_irqrestore(&ep->dev->lock, flags);
 		return -EINVAL;
 	}
-- 
2.19.1