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Wed, 02 Sep 2026 23:48:51 -0700 (PDT) Date: Wed, 02 Sep 2026 23:48:51 -0700 In-Reply-To: <6a85e576.f7a79266.2f965f.003f.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a991853.27a413cd.1e878c.0015.GAE@google.com> Subject: Forwarded: Re: [PATCH] usb: core: fix GPF on disconnect when interface claimed before registration From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [PATCH] usb: core: fix GPF on disconnect when interface claimed before registration Author: khiemtranzo532001@gmail.com #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index f63004417..59e74872b 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -562,7 +562,6 @@ int usb_driver_claim_interface(struct usb_driver *driver, if (!iface->authorized) return -ENODEV; - dev->driver = &driver->driver; usb_set_intfdata(iface, data); iface->needs_binding = 0; @@ -580,11 +579,19 @@ int usb_driver_claim_interface(struct usb_driver *driver, else pm_runtime_set_active(dev); - /* if interface was already added, bind now; else let - * the future device_add() bind it, bypassing probe() - */ - if (device_is_registered(dev)) + if (device_is_registered(dev)) { + dev->driver = &driver->driver; retval = device_bind_driver(dev); + } else { + /* + * Interface not yet registered: record the claim without + * setting dev->driver. usb_set_configuration() will call + * device_bind_driver() explicitly after device_add(), which + * skips ->probe() and attaches knode_driver so teardown is safe. + */ + iface->claimed = 1; + iface->claimed_driver = driver; + } if (retval) { dev->driver = NULL; diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c index 75e2bfd74..73c630750 100644 --- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -2269,8 +2269,23 @@ int usb_set_configuration(struct usb_device *dev, int configuration) if (ret != 0) { dev_err(&dev->dev, "device_add(%s) --> %d\n", dev_name(&intf->dev), ret); + intf->claimed = 0; + intf->claimed_driver = NULL; continue; } + if (intf->claimed) { + intf->dev.driver = &intf->claimed_driver->driver; + ret = device_bind_driver(&intf->dev); + if (ret) { + dev_err(&dev->dev, + "device_bind_driver(%s) --> %d\n", + dev_name(&intf->dev), ret); + intf->dev.driver = NULL; + intf->condition = USB_INTERFACE_UNBOUND; + } + intf->claimed = 0; + intf->claimed_driver = NULL; + } create_intf_ep_devs(intf); } diff --git a/include/linux/usb.h b/include/linux/usb.h index 1da4ad161..0ec743e76 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -266,6 +266,8 @@ struct usb_interface { unsigned needs_binding:1; /* needs delayed unbind/rebind */ unsigned resetting_device:1; /* true: bandwidth alloc after reset */ unsigned authorized:1; /* used for interface authorization */ + unsigned claimed:1; /* driver claimed before device_add() */ + struct usb_driver *claimed_driver; /* driver for deferred bind */ enum usb_wireless_status wireless_status; struct work_struct wireless_status_work; -- 2.34.1