From nobody Mon Feb 9 04:56:32 2026 Received: from azure-sdnproxy.icoremail.net (azure-sdnproxy.icoremail.net [207.46.229.174]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 28BEE1F181F; Thu, 5 Feb 2026 03:03:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=207.46.229.174 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770260627; cv=none; b=RLDdMkhLHOQWSzN9v0wf1VonN6xBFE4hZNqHbNoTTzv6eXcI/ZlVjTMnlr6CQV2Fku3wORjdWQKAqg9pOsgLYP+8Hnw2TB3xUBHsrRa5h965Zim/AorWL7viE/BWaydQRWHYyNrdZ4CTHOt4C8Tz4mQtpshpemFJEmTSGr3SsXw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770260627; c=relaxed/simple; bh=7snZf3xWO7w7qme4Nvs/uKYHO7QsUP2wle692tObmsM=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=Y66CJ4aOFotJdpfloQkggDjYL+tzzkDePdy+TrvOFZ/xozTi2hZK5JWMtC3v2P8LRmIQy56RlPXuwetL9klN8TSANCQmzVaKmhdyDHtreBAToPt0PrEhzo09hN+0keGVzjkZEcBL+ltfC61ltK6guL/6jv3IYjs1wz07NB/JGaY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=zju.edu.cn; spf=fail smtp.mailfrom=zju.edu.cn; arc=none smtp.client-ip=207.46.229.174 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=zju.edu.cn Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=zju.edu.cn Received: from zju.edu.cn (unknown [218.12.17.60]) by mtasvr (Coremail) with SMTP id _____wDX34eCCIRp1MGBAA--.17594S3; Thu, 05 Feb 2026 11:03:30 +0800 (CST) Received: from ubuntu.localdomain (unknown [218.12.17.60]) by mail-app1 (Coremail) with SMTP id yy_KCgAHgdp3CIRp5OIHBg--.13127S2; Thu, 05 Feb 2026 11:03:21 +0800 (CST) From: Duoming Zhou To: netdev@vger.kernel.org Cc: linux-atm-general@lists.sourceforge.net, linux-kernel@vger.kernel.org, 3chas3@gmail.com, Duoming Zhou Subject: [PATCH net] atm: fore200e: fix use-after-free in tasklets during device removal Date: Thu, 5 Feb 2026 11:03:17 +0800 Message-Id: <20260205030317.39190-1-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: yy_KCgAHgdp3CIRp5OIHBg--.13127S2 X-CM-SenderInfo: qssqjiasttq6lmxovvfxof0/1tbiAwQNAWmDoQcK+AAUsh X-CM-DELIVERINFO: =?B?B/17KAXKKxbFmtjJiESix3B1w3uoVhYI+vyen2ZzBEkOnu5chDpkB+ZdGnv/zQ0PbP CR1+U8zldnsn1nDMavq5TA/0qMhglio51OpoBZ7f5d8y3jxNiXI00LvtFLlZQBfsLiHk8P j9RQOd6DkVROwuLHMpaY4g0S53FMlCyUPdKkU+k48qgyEkEwrQ2siKb3+6U3tA== X-Coremail-Antispam: 1Uk129KBj93XoW7KF1Dtw43Xr4UJrWrJr45XFc_yoW8WFy8p3 y7Cw47Cry8JrWj9w17Jw1UWr1ruFn3ZFWYkwsrK3y2qF1FvF10vr15tF4DWFWjk347ZFZ2 kr1ktF13G34DJFgCm3ZEXasCq-sJn29KB7ZKAUJUUUU8529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUUvvb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_tr0E3s1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIE14v26rxl6s0DM28EF7xvwVC2z280aVCY1x0267AK xVW0oVCq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc804VCY07AIYIkI8VC2zVCFFI0UMc 02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUGVWUXwAv7VC2z280aVAF wI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JM4x0Y48IcxkI7V AKI48G6xCjnVAKz4kxMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I 3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxV WUAVWUtwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8I cVCY1x0267AKxVWUJVW8JwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aV AFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVWUJVW8JbIYCTnIWIevJa73UjIFyTuY vjxU72NtDUUUU Content-Type: text/plain; charset="utf-8" When the PCA-200E or SBA-200E adapters is being detached, the fore200e is deallocated. However, the tx_tasklet or rx_tasklet may still be running or pending, leading to use-after-free bug when the already freed fore200e is accessed again in fore200e_tx_tasklet() or fore200e_rx_tasklet(). One of the race conditions can occur as follows: CPU 0 (cleanup) | CPU 1 (tasklet) fore200e_pca_remove_one() | fore200e_interrupt() fore200e_shutdown() | tasklet_schedule() kfree(fore200e) | fore200e_tx_tasklet() | fore200e-> // UAF Fix this by ensuring tx_tasklet or rx_tasklet is properly canceled before the fore200e is released. Add tasklet_kill() in fore200e_shutdown() to synchronize with any pending or running tasklets. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Duoming Zhou --- drivers/atm/fore200e.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/atm/fore200e.c b/drivers/atm/fore200e.c index f62e3857144..7470daf9469 100644 --- a/drivers/atm/fore200e.c +++ b/drivers/atm/fore200e.c @@ -358,7 +358,12 @@ fore200e_shutdown(struct fore200e* fore200e) printk(FORE200E "removing device %s at 0x%lx, IRQ %s\n", fore200e->name, fore200e->phys_base,=20 fore200e_irq_itoa(fore200e->irq)); - =20 + +#ifdef FORE200E_USE_TASKLET + tasklet_kill(&fore200e->tx_tasklet); + tasklet_kill(&fore200e->rx_tasklet); +#endif + if (fore200e->state > FORE200E_STATE_RESET) { /* first, reset the board to prevent further interrupts or data transfers= */ fore200e_reset(fore200e, 0); --=20 2.34.1