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Wed, 05 Aug 2026 22:27:45 -0700 (PDT) From: Jeffin Philip To: jeffinphilip14@gmail.com Cc: gregkh@linuxfoundation.org, i@zenithal.me, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, shuah@kernel.org, stable@vger.kernel.org, syzbot+af76b01c9a0f0ab60fb0@syzkaller.appspotmail.com, valentina.manea.m@gmail.com Subject: Re: [PATCH] usbip: usbip_host: Fix null pointer dereference in rebind_store Date: Thu, 6 Aug 2026 10:57:26 +0530 Message-ID: <20260806052726.24793-1-jeffinphilip14@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260806051726.24343-1-jeffinphilip14@gmail.com> References: <20260806051726.24343-1-jeffinphilip14@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On 06 Aug 2026, 05:17 UTC, Jeffin Philip wrote: >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. Reproduce the issue using: echo "add 1-1" > /sys/bus/usb/drivers/usbip-host/match_busid echo "1-1" > /sys/bus/usb/drivers/usbip-host/rebind Thanks, Jeffin