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Thu, 17 Sep 2026 08:08:55 -0700 (PDT) Date: Thu, 17 Sep 2026 11:08:52 -0400 From: Alan Stern To: CJ Cc: gregkh@linuxfoundation.org, kees@kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [BUG] usb: dummy_hcd: general protection fault in set_link_state on unbind Message-ID: References: <34667d49.9099.1a09f41e473.Coremail.firefly0158@163.com> 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=us-ascii Content-Disposition: inline In-Reply-To: <34667d49.9099.1a09f41e473.Coremail.firefly0158@163.com> On Thu, Sep 17, 2026 at 04:00:00PM +0800, CJ wrote: > > Hi, > > > I am reporting a general protection fault in the dummy_hcd link-state handling, > triggered by a syzkaller USB reproducer. The issue is reproducible with HEAD > commit cee9395acd8043be0644b25c34bfa86623f2b935 (v7.3-rc1, Linux 7.3.0-rc1). > > > The reproducer connects a synthetic HID USB device through dummy_hcd and then > unbinds the dummy_hcd.0 platform device by writing its name to the driver's > unbind attribute. The failure happens during the teardown that follows. This patch: https://lore.kernel.org/linux-usb/18ec3122-7566-49e5-9964-1028857405b1@mail.kernel.org/ was submitted at the end of July but it hasn't been merged yet. Does it fix the problem? Alan Stern