linux-kernel - [PATCH] usb: cdnsp: Fixes issue with redundant Status Stage

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20230307111420.376056-1-pawell@cadence.com>
Date:   Tue, 7 Mar 2023 06:14:20 -0500
From:   Pawel Laszczak <pawell@...ence.com>
To:     <peter.chen@...nel.org>
CC:     <gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <pawell@...ence.com>,
        <stable@...r.kernel.org>
Subject: [PATCH] usb: cdnsp: Fixes issue with redundant Status Stage

In some cases, driver trees to send Status Stage twice.
The first one from upper layer of gadget usb subsystem and
second time from controller driver.
This patch fixes this issue and remove tricky handling of
SET_INTERFACE from controller driver which is no longer
needed.

cc: <stable@...r.kernel.org>
Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver")
Signed-off-by: Pawel Laszczak <pawell@...ence.com>
---
 drivers/usb/cdns3/cdnsp-ep0.c | 19 +------------------
 1 file changed, 1 insertion(+), 18 deletions(-)

diff --git a/drivers/usb/cdns3/cdnsp-ep0.c b/drivers/usb/cdns3/cdnsp-ep0.c
index 9b8325f82499..d63d5d92f255 100644
--- a/drivers/usb/cdns3/cdnsp-ep0.c
+++ b/drivers/usb/cdns3/cdnsp-ep0.c
@@ -403,20 +403,6 @@ static int cdnsp_ep0_std_request(struct cdnsp_device *pdev,
 	case USB_REQ_SET_ISOCH_DELAY:
 		ret = cdnsp_ep0_set_isoch_delay(pdev, ctrl);
 		break;
-	case USB_REQ_SET_INTERFACE:
-		/*
-		 * Add request into pending list to block sending status stage
-		 * by libcomposite.
-		 */
-		list_add_tail(&pdev->ep0_preq.list,
-			      &pdev->ep0_preq.pep->pending_list);
-
-		ret = cdnsp_ep0_delegate_req(pdev, ctrl);
-		if (ret == -EBUSY)
-			ret = 0;
-
-		list_del(&pdev->ep0_preq.list);
-		break;
 	default:
 		ret = cdnsp_ep0_delegate_req(pdev, ctrl);
 		break;
@@ -474,9 +460,6 @@ void cdnsp_setup_analyze(struct cdnsp_device *pdev)
 	else
 		ret = cdnsp_ep0_delegate_req(pdev, ctrl);
 
-	if (!len)
-		pdev->ep0_stage = CDNSP_STATUS_STAGE;
-
 	if (ret == USB_GADGET_DELAYED_STATUS) {
 		trace_cdnsp_ep0_status_stage("delayed");
 		return;
@@ -484,6 +467,6 @@ void cdnsp_setup_analyze(struct cdnsp_device *pdev)
 out:
 	if (ret < 0)
 		cdnsp_ep0_stall(pdev);
-	else if (pdev->ep0_stage == CDNSP_STATUS_STAGE)
+	else if (!len && pdev->ep0_stage != CDNSP_STATUS_STAGE)
 		cdnsp_status_stage(pdev);
 }
-- 
2.25.1