linux-kernel - [PATCH v2] char: xillybus: Check endpoint type before allocing

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Message-Id: <20220514114819.2773691-1-zheyuma97@gmail.com>
Date:   Sat, 14 May 2022 19:48:19 +0800
From:   Zheyu Ma <zheyuma97@...il.com>
To:     eli.billauer@...il.com, arnd@...db.de, gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, Zheyu Ma <zheyuma97@...il.com>
Subject: [PATCH v2] char: xillybus: Check endpoint type before allocing

The driver submits bulk urb without checking the endpoint type is
actually bulk.

[    3.108690] usb 1-1: BOGUS urb xfer, pipe 3 != type 1
[    3.108983] WARNING: CPU: 0 PID: 211 at drivers/usb/core/urb.c:503 usb_submit_urb+0xcd9/0x18b0
[    3.110976] RIP: 0010:usb_submit_urb+0xcd9/0x18b0
[    3.115318] Call Trace:
[    3.115452]  <TASK>
[    3.115570]  try_queue_bulk_in+0x43c/0x6e0 [xillyusb]
[    3.115838]  xillyusb_probe+0x488/0x1230 [xillyusb]

Add a check in endpoint_alloc() to fix the bug.

Signed-off-by: Zheyu Ma <zheyuma97@...il.com>
---
Changes in v2:
    - Check the endpoint type at probe time
---
 drivers/char/xillybus/xillyusb.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/char/xillybus/xillyusb.c b/drivers/char/xillybus/xillyusb.c
index dc3551796e5e..4467f13993ef 100644
--- a/drivers/char/xillybus/xillyusb.c
+++ b/drivers/char/xillybus/xillyusb.c
@@ -167,6 +167,7 @@ struct xillyusb_dev {
 	struct device		*dev; /* For dev_err() and such */
 	struct kref		kref;
 	struct workqueue_struct	*workq;
+	struct usb_interface *intf;
 
 	int error;
 	spinlock_t error_lock; /* protect @error */
@@ -475,6 +476,25 @@ static void endpoint_dealloc(struct xillyusb_endpoint *ep)
 	kfree(ep);
 }
 
+static int xillyusb_check_endpoint(struct xillyusb_dev *xdev, u8 ep_num)
+{
+	struct usb_host_interface *if_desc = xdev->intf->altsetting;
+	int i;
+
+	for (i = 0; i < if_desc->desc.bNumEndpoints; i++) {
+		struct usb_endpoint_descriptor *ep = &if_desc->endpoint[i].desc;
+
+		if (ep->bEndpointAddress != ep_num)
+			continue;
+
+		if ((usb_pipein(ep_num) && usb_endpoint_is_bulk_in(ep)) ||
+			(usb_pipeout(ep_num) && usb_endpoint_is_bulk_out(ep)))
+			return 0;
+	}
+
+	return -EINVAL;
+}
+
 static struct xillyusb_endpoint
 *endpoint_alloc(struct xillyusb_dev *xdev,
 		u8 ep_num,
@@ -482,10 +502,14 @@ static struct xillyusb_endpoint
 		unsigned int order,
 		int bufnum)
 {
-	int i;
+	int i, ret;
 
 	struct xillyusb_endpoint *ep;
 
+	ret = xillyusb_check_endpoint(xdev, ep_num);
+	if (ret)
+		return NULL;
+
 	ep = kzalloc(sizeof(*ep), GFP_KERNEL);
 
 	if (!ep)
@@ -2125,6 +2149,7 @@ static int xillyusb_probe(struct usb_interface *interface,
 	mutex_init(&xdev->process_in_mutex);
 	mutex_init(&xdev->msg_mutex);
 
+	xdev->intf = interface;
 	xdev->udev = usb_get_dev(interface_to_usbdev(interface));
 	xdev->dev = &interface->dev;
 	xdev->error = 0;
-- 
2.25.1