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([2405:201:682f:383f:569e:7ed4:3735:ea2a]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2d62e3a1031sm18300385ad.57.2026.08.21.05.12.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Aug 2026 05:12:29 -0700 (PDT) From: Deepanshu Kartikey To: gregkh@linuxfoundation.org Cc: kees@kernel.org, stern@rowland.harvard.edu, lgs201920130244@gmail.com, balbi@ti.com, ribalda@kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Deepanshu Kartikey , syzbot+2ec7fc1793a63864d9d6@syzkaller.appspotmail.com Subject: [PATCH] usb: gadget: net2280: fix NULL pointer deref in usb_reinit_338x() Date: Fri, 21 Aug 2026 17:42:20 +0530 Message-ID: <20260821121220.13006-1-kartikey406@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit net2280_probe() only maps dev->llregs when the PLX_PCIE quirk bit is set. usb_reinit() dispatches to usb_reinit_338x() for any device that doesn't have PLX_LEGACY set, assuming such a device must have PLX_PCIE set (and thus llregs mapped). That assumption holds for every entry in the driver's pci_device_id table, but a forced driver bind (e.g. via sysfs bind/driver_override) can invoke probe() with quirks that have neither bit set, leaving llregs NULL and crashing in usb_reinit_338x() on the first readl(). Reject probe() early when quirks has neither PLX_LEGACY nor PLX_PCIE set, instead of proceeding into a reinit path that assumes one of them is always present. Fixes: adc82f77bee3 ("usb: gadget: net2280: Add support for PLX USB338X") Reported-by: syzbot+2ec7fc1793a63864d9d6@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=2ec7fc1793a63864d9d6 Signed-off-by: Deepanshu Kartikey --- drivers/usb/gadget/udc/net2280.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c index 7c5f30cfd24d..02d12c2ad58b 100644 --- a/drivers/usb/gadget/udc/net2280.c +++ b/drivers/usb/gadget/udc/net2280.c @@ -3708,6 +3708,17 @@ static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id) writel(0, &dev->usb->usbctl); } + /* usb_reinit() dispatches on PLX_LEGACY vs PLX_PCIE and assumes + * every non-legacy chip has llregs mapped (PLX_PCIE branch above). + * A forced/mismatched driver bind can hand us quirks that satisfy + * neither, so refuse to proceed rather than dereference NULL. + */ + if (!(dev->quirks & (PLX_LEGACY | PLX_PCIE))) { + ep_err(dev, "unsupported device (quirks=%#lx)\n", dev->quirks); + retval = -ENODEV; + goto done; + } + usb_reset(dev); usb_reinit(dev); -- 2.43.0