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[195.14.219.6]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4997abf917csm2297195e9.13.2026.08.11.09.02.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Aug 2026 09:02:22 -0700 (PDT) From: Vasileios Almpanis Date: Tue, 11 Aug 2026 18:02:03 +0200 Subject: [PATCH] usb: gadget: pch_udc: don't call pch_udc_remove() from the probe error path Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260811-pch-v1-1-f79801c1cd91@gmail.com> X-B4-Tracking: v=1; b=H4sIAHpHe2oC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDIzMDC0ND3YLkDF2zZBOLFONE8+SkVFMloMqCotS0zAqwKdGxEH5xaVJWanI JSKtSbS0AHaRbaWcAAAA= X-Change-ID: 20260811-pch-6c48d3a7cbe5 To: Greg Kroah-Hartman , Felipe Balbi , Mike Frysinger , Sebastian Andrzej Siewior Cc: Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+3e2e533aa1b2a75525e7@syzkaller.appspotmail.com, Vasileios Almpanis X-Mailer: b4 0.16.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1786464141; l=2932; i=vasilisalmpanis@gmail.com; s=20260731; h=from:subject:message-id; bh=ibA3N4naXcwQ7FSrp+/HhRESL8Wumq1H1Kkn6Gvv8rA=; b=54dc0DOWz3VR5GBJaayo3jdS/qX5IaPAMOTT8bPXOxO4NOFhbd1KqchgerXeSyNcFOohmRH9r JvQ/xY/WjdxDcld+YvRBupDjnQWLi9O46i4clV4jx6WKuQH0RIuajGT X-Developer-Key: i=vasilisalmpanis@gmail.com; a=ed25519; pk=gn5Uo6yL8Tlpq5uATxA3nqoq+U8eWLRbjD+bOk0qSpU= Probe error paths go to finished label which calls phc_udc_remove. It in turn starts with an unconditional usb_del_gadget_udc(). If probe fails before the gadget is added then we put a non-initialized kobject (gadget.dev) and a WARN is triggered in kobject_put(). WARNING: lib/kobject.c:734 at kobject_put+0x252/0x640 lib/kobject.c:734 Call Trace: put_device+0x1f/0x30 drivers/base/core.c:3880 pch_udc_remove+0x47/0x510 drivers/usb/gadget/udc/pch_udc.c:2986 pch_udc_probe+0xcc6/0x1130 drivers/usb/gadget/udc/pch_udc.c:3109 If usb_add_gadget_udc() in turn fails, it has already dropped the gadget reference, so the extra usb_del_gadget_udc() is a double put. Split the hardware/DMA teardown out into pch_udc_cleanup() and call only that from the probe error path. Fixes: 0f91349b89f3 ("usb: gadget: convert all users to the new udc infrast= ructure") Reported-by: syzbot+3e2e533aa1b2a75525e7@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?extid=3D3e2e533aa1b2a75525e7 Tested-by: syzbot+3e2e533aa1b2a75525e7@syzkaller.appspotmail.com Signed-off-by: Vasileios Almpanis --- drivers/usb/gadget/udc/pch_udc.c | 26 ++++++++++++++++---------- 1 file changed, 16 insertions(+), 10 deletions(-) diff --git a/drivers/usb/gadget/udc/pch_udc.c b/drivers/usb/gadget/udc/pch_= udc.c index 0a6886428739..5704aff2b09b 100644 --- a/drivers/usb/gadget/udc/pch_udc.c +++ b/drivers/usb/gadget/udc/pch_udc.c @@ -2979,16 +2979,8 @@ static void pch_udc_shutdown(struct pci_dev *pdev) pch_udc_set_disconnect(dev); } =20 -static void pch_udc_remove(struct pci_dev *pdev) +static void pch_udc_cleanup(struct pch_udc_dev *dev) { - struct pch_udc_dev *dev =3D pci_get_drvdata(pdev); - - usb_del_gadget_udc(&dev->gadget); - - /* gadget driver must not be registered */ - if (dev->driver) - dev_err(&pdev->dev, - "%s: gadget driver still bound!!!\n", __func__); /* dma pool cleanup */ dma_pool_destroy(dev->data_requests); =20 @@ -3016,6 +3008,20 @@ static void pch_udc_remove(struct pci_dev *pdev) pch_udc_exit(dev); } =20 +static void pch_udc_remove(struct pci_dev *pdev) +{ + struct pch_udc_dev *dev =3D pci_get_drvdata(pdev); + + usb_del_gadget_udc(&dev->gadget); + + /* gadget driver must not be registered */ + if (dev->driver) + dev_err(&pdev->dev, + "%s: gadget driver still bound!!!\n", __func__); + + pch_udc_cleanup(dev); +} + static int __maybe_unused pch_udc_suspend(struct device *d) { struct pch_udc_dev *dev =3D dev_get_drvdata(d); @@ -3106,7 +3112,7 @@ static int pch_udc_probe(struct pci_dev *pdev, const = struct pci_device_id *id) return 0; =20 finished: - pch_udc_remove(pdev); + pch_udc_cleanup(dev); return retval; } =20 --- base-commit: d58772d8520c7ef247c4b95c9bd76d3a25da9ff5 change-id: 20260811-pch-6c48d3a7cbe5 Best regards, -- =20 Vasileios Almpanis