From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6593AC43334 for ; Mon, 13 Jun 2022 10:40:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344267AbiFMKkl (ORCPT ); Mon, 13 Jun 2022 06:40:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35654 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347341AbiFMKiz (ORCPT ); Mon, 13 Jun 2022 06:38:55 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0AB6B13EBA; Mon, 13 Jun 2022 03:23:07 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id B896CB80EA3; Mon, 13 Jun 2022 10:23:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 260E8C3411C; Mon, 13 Jun 2022 10:23:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1655115784; bh=svTYRwQoEOZR9ALrZn3icahIfblnTbsuQORE2Oif/Ag=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vaox896f9rAYvSodYoc1n/p+dg8NQdS84Z/EST5OFGvwDb+S7s8q//WhAkVyxSUXB fl2eEhfDdaKTDNnVUKJJfTNiAMZLADZJ0g9nitUDR6tCiym0ov9MapsUTg2+sZxcBW O6fwoq28LWOw9yLaSQmFsFlP0dLKcaV0N5G0EONg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Kyle Smith , Chaitanya Kulkarni , Hannes Reinecke , Christoph Hellwig , Sasha Levin Subject: [PATCH 4.14 029/218] nvme-pci: fix a NULL pointer dereference in nvme_alloc_admin_tags Date: Mon, 13 Jun 2022 12:08:07 +0200 Message-Id: <20220613094915.157160552@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220613094908.257446132@linuxfoundation.org> References: <20220613094908.257446132@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Smith, Kyle Miller (Nimble Kernel) [ Upstream commit da42761181627e9bdc37d18368b827948a583929 ] In nvme_alloc_admin_tags, the admin_q can be set to an error (typically -ENOMEM) if the blk_mq_init_queue call fails to set up the queue, which is checked immediately after the call. However, when we return the error message up the stack, to nvme_reset_work the error takes us to nvme_remove_dead_ctrl() nvme_dev_disable() nvme_suspend_queue(&dev->queues[0]). Here, we only check that the admin_q is non-NULL, rather than not an error or NULL, and begin quiescing a queue that never existed, leading to bad / NULL pointer dereference. Signed-off-by: Kyle Smith Reviewed-by: Chaitanya Kulkarni Reviewed-by: Hannes Reinecke Signed-off-by: Christoph Hellwig Signed-off-by: Sasha Levin --- drivers/nvme/host/pci.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 92f269a0846c..de23f2814877 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1424,6 +1424,7 @@ static int nvme_alloc_admin_tags(struct nvme_dev *dev) dev->ctrl.admin_q = blk_mq_init_queue(&dev->admin_tagset); if (IS_ERR(dev->ctrl.admin_q)) { blk_mq_free_tag_set(&dev->admin_tagset); + dev->ctrl.admin_q = NULL; return -ENOMEM; } if (!blk_get_queue(dev->ctrl.admin_q)) { -- 2.35.1