From nobody Mon Feb 9 13:08:19 2026 Received: from zg8tmja2lje4os4yms4ymjma.icoremail.net (zg8tmja2lje4os4yms4ymjma.icoremail.net [206.189.21.223]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4EB4E3A1C9; Sun, 8 Feb 2026 06:26:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=206.189.21.223 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770531971; cv=none; b=oI0Axlgj+NNBg6sTrbBUGeDQpE8FeBYcW+trEM4WA5URX4bPwFMo8b7BsKN2Z9Ucp9+7WkW3ZdRwr5EhJDGveXrgZObGNWb2KUBj0scP0BAhFUR4haC5hmfTiYU4ff2itxR9ngySLa4/vIJiibk7rug1mvwaEPRDN09cacnULY4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770531971; c=relaxed/simple; bh=tT5Cn7I1ie77p4tSMWCoNdRxpUjP8Va6svkAlWLwnsE=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=PuEaF1y05SeSsZaxjZpYCdI7Jt/kpvipZtI2fYS2lexHJLgKjySHl1+ICoMAy8AxWcqHg0OLJ2Ke1v5ZAiIbRuqqu2lcBH+Vk0C6esfUXIOkwwajhTjnQV6Oes3nbqvma4bbLs1/iqVgQKHcgG0Frp1mbCdFbYJ0xVU+BhPgkZE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=zju.edu.cn; spf=pass smtp.mailfrom=zju.edu.cn; arc=none smtp.client-ip=206.189.21.223 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=zju.edu.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=zju.edu.cn Received: from zju.edu.cn (unknown [218.12.17.94]) by mtasvr (Coremail) with SMTP id _____wBHxnBoLIhpVdGSAA--.12724S3; Sun, 08 Feb 2026 14:25:46 +0800 (CST) Received: from ubuntu.localdomain (unknown [218.12.17.94]) by mail-app2 (Coremail) with SMTP id zC_KCgD3EEVkLIhp45u5BQ--.23362S2; Sun, 08 Feb 2026 14:25:44 +0800 (CST) From: Duoming Zhou To: linux-serial@vger.kernel.org Cc: linux-kernel@vger.kernel.org, jikos@kernel.org, dsterba@suse.com, gregkh@linuxfoundation.org, jirislaby@kernel.org, kuba@kernel.org, alexander.deucher@amd.com, akpm@linux-foundation.org, pkshih@realtek.com, tglx@kernel.org, mingo@kernel.org, Duoming Zhou Subject: [PATCH] tty: ipwireless: Fix use-after-free in tasklet during device removal Date: Sun, 8 Feb 2026 14:25:38 +0800 Message-Id: <20260208062538.29608-1-duoming@zju.edu.cn> X-Mailer: git-send-email 2.34.1 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 X-CM-TRANSID: zC_KCgD3EEVkLIhp45u5BQ--.23362S2 X-CM-SenderInfo: qssqjiasttq6lmxovvfxof0/1tbiAwMPAWmHlYcDxgABs2 X-CM-DELIVERINFO: =?B?YttiAAXKKxbFmtjJiESix3B1w3uoVhYI+vyen2ZzBEkOnu5chDpkB+ZdGnv/zQ0PbP CR1w8GsfJQzmAq1cHhaxNT+qPA3D992N8znMd1+DWWIGr/7CEgkmMurtyzTA4UjreQs4B/ coVP/6qI5ARQuOJ5bNzDKmQ2SAb0euAd1f9AkxQJQlhnpD24zyZxQTFEYCyWRQ== X-Coremail-Antispam: 1Uk129KBj93XoWxJryxKFWfZw1fXw4ktr1UJwc_yoW8Ar48pF W8Gw4qkFW8Kr1jvw4jqa1xZry8Xas3KFy7Wr4vk3yrZr1rJr10qrnxAa4DGr45KayUZ3Z5 Wrn0qr15Gan2yFXCm3ZEXasCq-sJn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUU9Kb4IE77IF4wAFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Cr0_Gr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v2 6rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6xACxx1l5I 8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AK xVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lF7xvr2IYc2Ij64 vIr40E4x8a64kEw24lFIxGxcIEc7CjxVA2Y2ka0xkIwI1l42xK82IYc2Ij64vIr41l4I8I 3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxV WUGVWUWwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAF wI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcI k0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j 6r4UJbIYCTnIWIevJa73UjIFyTuYvjxU7xwIDUUUU Content-Type: text/plain; charset="utf-8" When IPWireless PCMCIA card is being detached, the ipw_hardware is deallocated in ipwireless_hardware_free(). However, the hw->tasklet may still be running or pending, leading to use-after-free bugs when the already freed ipw_hardware is accessed again in ipwireless_do_tasklet(). One race condition scenario is as follows: CPU 0 (cleanup) | CPU 1 (interrupt) ipwireless_hardware_free() | ipwireless_interrupt() ipwireless_stop_interrupts()| ipwireless_handle_v1_interrupt() do_close_hardware() | tasklet_schedule() synchronize_irq() | kfree(hw) //FREE | ipwireless_do_tasklet() //handler | hw =3D from_tasklet() //USE | hw-> //USE Fix this by ensuring hw->tasklet is properly canceled before ipw_hardware is released. Add tasklet_kill() in ipwireless_stop_interrupts() to synchronize with any pending or running tasklet. Since do_close_hardware() could prevent further interrupts, place tasklet_kill() after it to avoid the tasklet being rescheduled by ipwireless_interrupt(). Fixes: 099dc4fb6265 ("ipwireless: driver for PC Card 3G/UMTS modem") Signed-off-by: Duoming Zhou --- drivers/tty/ipwireless/hardware.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/tty/ipwireless/hardware.c b/drivers/tty/ipwireless/har= dware.c index e18848267be..c736cba751f 100644 --- a/drivers/tty/ipwireless/hardware.c +++ b/drivers/tty/ipwireless/hardware.c @@ -1725,6 +1725,7 @@ void ipwireless_stop_interrupts(struct ipw_hardware *= hw) =20 /* Prevent the hardware from sending any more interrupts */ do_close_hardware(hw); + tasklet_kill(&hw->tasklet); } } =20 --=20 2.34.1