From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 968A4359F9D; Tue, 16 Dec 2025 12:05:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765886704; cv=none; b=CBo2SfKogGdITzgo9yA5XP+CjiAwZHzVd+ALEs50RGgfdvjUoh5iQwETOI2YsWshbLOjsi7OmXu8PhcLXg03dV/SlkJfQl1xSR/dNiOMey9gk1PlcKEjmQON9T+hMYOzbNfNT9jxTKRQsc32hO7op0OL4mCU6K1IuDFrSpu9QZo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765886704; c=relaxed/simple; bh=gHQHSIRIuXx4IUX+aDkJm27DJE5yW7qTPfX2USZBRq0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=my3NZjbuUuD/xgPhcg242k6QUvySw2PmrCSPLEPxT8VqwAjFv+F06WmK6q/b4AibKsnjaaibUdLvYad8pLsPnzTZACfTAfJF0Juf4ktdUeLKcABTcuLUY+TZ+hI6MSmF6D1sS0X0qWzJjBHICCVT+HtmWxF9/Qs1EVlKJYcvwfc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=M3d7z8IH; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="M3d7z8IH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DF4BCC4CEF5; Tue, 16 Dec 2025 12:05:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1765886704; bh=gHQHSIRIuXx4IUX+aDkJm27DJE5yW7qTPfX2USZBRq0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=M3d7z8IHaP99r2ln/CvcvaJxhj6J+8a3+O8cPrlpiM/pJDCtEF18udDZFYYGK5OIu 5k0jDR7ZU9TAgbO5/ZCmxtewTt1br8lVPSCYO/3yo18JtTDX5snvIh77DJ6P1WyCUq FNPYUIZdOwzWoBGIgkeUdBPq4VDFs6xJScpqoKJI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Duoming Zhou , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 6.17 492/507] scsi: imm: Fix use-after-free bug caused by unfinished delayed work Date: Tue, 16 Dec 2025 12:15:33 +0100 Message-ID: <20251216111403.264133605@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251216111345.522190956@linuxfoundation.org> References: <20251216111345.522190956@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Duoming Zhou [ Upstream commit ab58153ec64fa3fc9aea09ca09dc9322e0b54a7c ] The delayed work item 'imm_tq' is initialized in imm_attach() and scheduled via imm_queuecommand() for processing SCSI commands. When the IMM parallel port SCSI host adapter is detached through imm_detach(), the imm_struct device instance is deallocated. However, the delayed work might still be pending or executing when imm_detach() is called, leading to use-after-free bugs when the work function imm_interrupt() accesses the already freed imm_struct memory. The race condition can occur as follows: CPU 0(detach thread) | CPU 1 | imm_queuecommand() | imm_queuecommand_lck() imm_detach() | schedule_delayed_work() kfree(dev) //FREE | imm_interrupt() | dev = container_of(...) //USE dev-> //USE Add disable_delayed_work_sync() in imm_detach() to guarantee proper cancellation of the delayed work item before imm_struct is deallocated. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Duoming Zhou Link: https://patch.msgid.link/20251028100149.40721-1-duoming@zju.edu.cn Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/imm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/scsi/imm.c b/drivers/scsi/imm.c index 0821cf994b986..8a099bc27e06c 100644 --- a/drivers/scsi/imm.c +++ b/drivers/scsi/imm.c @@ -1260,6 +1260,7 @@ static void imm_detach(struct parport *pb) imm_struct *dev; list_for_each_entry(dev, &imm_hosts, list) { if (dev->dev->port == pb) { + disable_delayed_work_sync(&dev->imm_tq); list_del_init(&dev->list); scsi_remove_host(dev->host); scsi_host_put(dev->host); -- 2.51.0