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Wed, 05 Aug 2026 22:17:46 -0700 (PDT) From: Jeffin Philip To: linux-usb@vger.kernel.org Cc: valentina.manea.m@gmail.com, shuah@kernel.org, i@zenithal.me, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Jeffin Philip , syzbot+af76b01c9a0f0ab60fb0@syzkaller.appspotmail.com Subject: [PATCH] usbip: usbip_host: Fix null pointer dereference in rebind_store Date: Thu, 6 Aug 2026 10:47:26 +0530 Message-ID: <20260806051726.24343-1-jeffinphilip14@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit rebind_store calls do_rebind which dereferences udev without checking if it is NULL. If busid is registered using match_busid but the device is not present in the first place, it triggers a null pointer dereference when we attempt to rebind the device. Fix this by checking explicitly for udev first and returning -ENODEV if udev is NULL. Reported-by: syzbot+af76b01c9a0f0ab60fb0@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=af76b01c9a0f0ab60fb0 Fixes: 4bfb141bc013 ("usbip: usbip_host: fix to hold parent lock for device_attach() calls") Cc: stable@vger.kernel.org Signed-off-by: Jeffin Philip --- drivers/usb/usbip/stub_main.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/usb/usbip/stub_main.c b/drivers/usb/usbip/stub_main.c index 79110a69d697..dfaedecedb81 100644 --- a/drivers/usb/usbip/stub_main.c +++ b/drivers/usb/usbip/stub_main.c @@ -256,6 +256,11 @@ static ssize_t rebind_store(struct device_driver *dev, const char *buf, if (!bid) return -ENODEV; + if (!bid->udev) { + put_busid_priv(bid); + return -ENODEV; + } + /* mark the device for deletion so probe ignores it during rescan */ bid->status = STUB_BUSID_OTHER; /* release the busid lock */ -- 2.55.0