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Miller" , Jakub Kicinski , Simon Horman , Alan Stern , Grant Grundler , Paolo Abeni , Douglas Anderson , linux-kernel@vger.kernel.org Subject: [PATCH v2] usb: core: Fix crash w/ usb_choose_configuration() if no driver Date: Mon, 11 Dec 2023 07:08:14 -0800 Message-ID: <20231211070808.v2.1.If27eb3bf7812f91ab83810f232292f032f4203e0@changeid> X-Mailer: git-send-email 2.43.0.472.g3155946c3a-goog MIME-Version: 1.0 X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on howler.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (howler.vger.email [0.0.0.0]); Mon, 11 Dec 2023 07:11:22 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1784998773775670612 X-GMAIL-MSGID: 1784998773775670612 It's possible that usb_choose_configuration() can get called when a USB device has no driver. In this case the recent commit a87b8e3be926 ("usb: core: Allow subclassed USB drivers to override usb_choose_configuration()") can cause a crash since it dereferenced the driver structure without checking for NULL. Let's add a check. A USB device with no driver is an anomaly, so make usb_choose_configuration() return immediately if there is no driver. This was seen in the real world when usbguard got ahold of a r8152 device at the wrong time. It can also be simulated via this on a computer with one r8152-based USB Ethernet adapter: cd /sys/bus/usb/drivers/r8152-cfgselector to_unbind="$(ls -d *-*)" real_dir="$(readlink -f "${to_unbind}")" echo "${to_unbind}" > unbind cd "${real_dir}" echo 0 > authorized echo 1 > authorized Fixes: a87b8e3be926 ("usb: core: Allow subclassed USB drivers to override usb_choose_configuration()") Signed-off-by: Douglas Anderson Reviewed-by: Alan Stern --- Changes in v2: - Return immediately if no driver, as per Alan. drivers/usb/core/generic.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/usb/core/generic.c b/drivers/usb/core/generic.c index dcb897158228..2be1e8901e2f 100644 --- a/drivers/usb/core/generic.c +++ b/drivers/usb/core/generic.c @@ -59,7 +59,11 @@ int usb_choose_configuration(struct usb_device *udev) int num_configs; int insufficient_power = 0; struct usb_host_config *c, *best; - struct usb_device_driver *udriver = to_usb_device_driver(udev->dev.driver); + struct usb_device_driver *udriver; + + if (!udev->dev.driver) + return -1; + udriver = to_usb_device_driver(udev->dev.driver); if (usb_device_is_owned(udev)) return 0;