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[104.229.42.148]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6bb3fb12082sm1540246d6.143.2024.07.24.18.04.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Jul 2024 18:04:49 -0700 (PDT) From: crwulff@gmail.com To: linux-usb@vger.kernel.org Cc: Greg Kroah-Hartman , Alan Stern , Roy Luo , Krishna Kurapati , Michael Grzeschik , yuan linyu , Paul Cercueil , Felipe Balbi , linux-kernel@vger.kernel.org, Chris Wulff , stable@vger.kernel.org Subject: [PATCH v2] usb: gadget: core: Check for unset descriptor Date: Wed, 24 Jul 2024 21:04:20 -0400 Message-ID: <20240725010419.314430-2-crwulff@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Chris Wulff 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. No current gadget driver is known to have this problem, but this may cause a hard-to-find bug during development of new gadgets. Fixes: 54f83b8c8ea9 ("USB: gadget: Reject endpoints with 0 maxpacket value") Cc: stable@vger.kernel.org Signed-off-by: Chris Wulff --- v2: Added WARN_ONCE message & clarification on causes v1: https://lore.kernel.org/all/20240721192048.3530097-2-crwulff@gmail.com/ --- drivers/usb/gadget/udc/core.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index 2dfae7a17b3f..81f9140f3681 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -118,12 +118,10 @@ 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) { - /* - * We should log an error message here, but we can't call - * dev_err() because there's no way to find the gadget - * given only ep. - */ + if (!ep->desc || usb_endpoint_maxp(ep->desc) == 0) { + WARN_ONCE(1, "%s: ep%d (%s) has %s\n", __func__, ep->address, ep->name, + (!ep->desc) ? "NULL descriptor" : "maxpacket 0"); + ret = -EINVAL; goto out; }