[PATCH 5.10] usb: cdns3: gadget: fix NULL pointer dereference in ep_queue

[Mikhail Dmitrichenko <mdmitrichenko@astralinux.ru>]

From: Yongchao Wu <yongchao.wu@autochips.com>

commit 7f6f127b9bc34bed35f56faf7ecb1561d6b39000 upstream.

When the gadget endpoint is disabled or not yet configured, the ep->desc
pointer can be NULL. This leads to a NULL pointer dereference when
__cdns3_gadget_ep_queue() is called, causing a kernel crash.

Add a check to return -ESHUTDOWN if ep->desc is NULL, which is the
standard return code for unconfigured endpoints.

This prevents potential crashes when ep_queue is called on endpoints
that are not ready.

Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
Cc: stable <stable@kernel.org>
Signed-off-by: Yongchao Wu <yongchao.wu@autochips.com>
Acked-by: Peter Chen <peter.chen@kernel.org>
Link: https://patch.msgid.link/20260331000407.613298-1-yongchao.wu@autochips.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mikhail Dmitrichenko <mdmitrichenko@astralinux.ru>
---
Backport fix for CVE-2026-31755
 drivers/usb/cdns3/gadget.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
index 61388e2089f5f..a64302acdfe6d 100644
--- a/drivers/usb/cdns3/gadget.c
+++ b/drivers/usb/cdns3/gadget.c
@@ -2587,6 +2587,9 @@ static int __cdns3_gadget_ep_queue(struct usb_ep *ep,
 	struct cdns3_request *priv_req;
 	int ret = 0;
 
+	if (!ep->desc)
+		return -ESHUTDOWN;
+
 	request->actual = 0;
 	request->status = -EINPROGRESS;
 	priv_req = to_cdns3_request(request);
-- 
2.47.3