FAILED: patch "[PATCH] usb: cdns3: gadget: fix NULL pointer dereference in ep_queue" failed to apply to 5.10-stable tree

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 7f6f127b9bc34bed35f56faf7ecb1561d6b39000
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026040751-calamity-average-fe6d@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 7f6f127b9bc34bed35f56faf7ecb1561d6b39000 Mon Sep 17 00:00:00 2001
From: Yongchao Wu <[email protected]>
Date: Tue, 31 Mar 2026 08:04:07 +0800
Subject: [PATCH] usb: cdns3: gadget: fix NULL pointer dereference in ep_queue

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.

index d59a60a16ec7..96d2a4c38b3f 100644
@@ -2589,6 +2589,9 @@ 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);