From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 68672374E60; Sat, 17 Oct 2026 17:31:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792258267; cv=none; b=rOJvtTlfuxK+7Yrube7YxT3TrJ/d+WCNPGQs1Fg6qanP/7+7lbDfOCrjo2RrCIKEeEmVz7N0Z9Spgt23ArobFpKIFU+8BbKuTMGCE8oajR59vTfKu+S1NG9lwt0M4aICRbfJpaClbDO7BhXHJHmkYGCBhWls7hUhYm3COHRjUeU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792258267; c=relaxed/simple; bh=jDsoeizQPdOu2407Zw+MHXTjf4oVn4MGDWkpMnJtww0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IeHDQldrncujZNb8M5dZ6nQl3jDM2hQ5lIhTxDIz29adU0SjMvVnU4HFu3r7Eex3T9/L0URvkXu/wRFSfWOj5wvr6miZotFcDENj9NUT//LJ5qAZ101BSpLAoSM3a5GPH8OWjWpHXzx1rFf0N14YtfDI2s6Ti3ygb3Zdc7EVE1c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=hHZVLMIz; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="hHZVLMIz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B24171F000C4; Sat, 17 Oct 2026 17:31:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1792258265; bh=BFLyWswKz5jWThxxBvMrIpn1gUZsWiqtDBUeQwaOl3o=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=hHZVLMIzl1l2DaJKMqVWgibSkt9hN98LdNxD2rH5umzZYKKuJRVdhRlKKDExS8kkD hYdXRyoQAU7Im+Rfa7k8GySFq///tqeVd/jeBRglI/SfQsf9Ziv/gNYLB4ES9XJK5C D5Z3H/bN/qT6Ig45a1bsOJLr5QDZOQhkl/v0e65s= 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 6.6 0826/1674] scsi: imm: Fix use-after-free bug caused by unfinished delayed work Date: Sat, 17 Oct 2026 17:51:38 +0200 Message-ID: <20261017160452.331694702@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261017160431.119607952@linuxfoundation.org> References: <20261017160431.119607952@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 6.6-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 07db98161a036..dbe0598ce4bf4 100644 --- a/drivers/scsi/imm.c +++ b/drivers/scsi/imm.c @@ -1269,6 +1269,7 @@ static void imm_detach(struct parport *pb) if (dev->dev->port == pb) { list_del_init(&dev->list); scsi_remove_host(dev->host); + cancel_delayed_work_sync(&dev->imm_tq); scsi_host_put(dev->host); parport_unregister_device(dev->dev); kfree(dev); -- 2.53.0