linux-kernel - [PATCH] usb: gadget: core: Check for unset descriptor

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Message-ID: <20240721192048.3530097-2-crwulff@gmail.com>
Date: Sun, 21 Jul 2024 15:20:49 -0400
From: crwulff@...il.com
To: linux-usb@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Roy Luo <royluo@...gle.com>,
	Krishna Kurapati <quic_kriskura@...cinc.com>,
	Michael Grzeschik <m.grzeschik@...gutronix.de>,
	yuan linyu <yuanlinyu@...onor.com>,
	Paul Cercueil <paul@...pouillou.net>,
	Felipe Balbi <balbi@...nel.org>,
	linux-kernel@...r.kernel.org,
	Chris Wulff <crwulff@...il.com>,
	stable@...r.kernel.org
Subject: [PATCH] usb: gadget: core: Check for unset descriptor

From: Chris Wulff <crwulff@...il.com>

Make sure the descriptor has been set before looking at maxpacket.
This fixes a null pointer panic in this case.

This may happen if the gadget doesn't properly set up the endpoint
for the current speed, or the gadget descriptors are malformed and
the descriptor for the speed/endpoint are not found.

Fixes: 54f83b8c8ea9 ("USB: gadget: Reject endpoints with 0 maxpacket value")
Cc: stable@...r.kernel.org
Signed-off-by: Chris Wulff <crwulff@...il.com>
---
 drivers/usb/gadget/udc/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 2dfae7a17b3f..36a5d5935889 100644
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -118,7 +118,7 @@ int usb_ep_enable(struct usb_ep *ep)
 		goto out;
 
 	/* UDC drivers can't handle endpoints with maxpacket size 0 */
-	if (usb_endpoint_maxp(ep->desc) == 0) {
+	if (!ep->desc || usb_endpoint_maxp(ep->desc) == 0) {
 		/*
 		 * We should log an error message here, but we can't call
 		 * dev_err() because there's no way to find the gadget
-- 
2.43.0