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Thu, 11 Dec 2025 21:20:50 -0800 (PST) From: Minseong Kim To: linux-input@vger.kernel.org Cc: dmitry.torokhov@gmail.com, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH] input: lkkbd: disable pending work before freeing device Date: Fri, 12 Dec 2025 14:16:23 +0900 Message-Id: <20251212051623.13891-1-ii4gsp@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251211031131.27141-1-ii4gsp@gmail.com> References: <20251211031131.27141-1-ii4gsp@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: quoted-printable Content-Type: text/plain; charset="utf-8" lkkbd_interrupt() schedules lk->tq via schedule_work(), and the work handler lkkbd_reinit() dereferences the lkkbd structure and its serio/input_dev fields. lkkbd_disconnect() and error paths in lkkbd_connect() free the lkkbd structure without preventing the reinit work from being queued again until serio_close() returns. This can allow the work handler to run after the structure has been freed, leading to a potential use-after-free. Use disable_work_sync() instead of cancel_work_sync() to ensure the reinit work cannot be re-queued, and call it both in lkkbd_disconnect() and in lkkbd_connect() error paths after serio_open(). Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Signed-off-by: Minseong Kim --- drivers/input/keyboard/lkkbd.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/input/keyboard/lkkbd.c b/drivers/input/keyboard/lkkbd.c index c035216dd27c..12a467ce00b5 100644 --- a/drivers/input/keyboard/lkkbd.c +++ b/drivers/input/keyboard/lkkbd.c @@ -670,7 +670,8 @@ static int lkkbd_connect(struct serio *serio, struct se= rio_driver *drv) =20 return 0; =20 - fail3: serio_close(serio); + fail3: disable_work_sync(&lk->tq); + serio_close(serio); fail2: serio_set_drvdata(serio, NULL); fail1: input_free_device(input_dev); kfree(lk); @@ -684,6 +685,8 @@ static void lkkbd_disconnect(struct serio *serio) { struct lkkbd *lk =3D serio_get_drvdata(serio); =20 + disable_work_sync(&lk->tq); + input_get_device(lk->dev); input_unregister_device(lk->dev); serio_close(serio); --=20 2.34.1