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 X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 250F2C31E5C for ; Mon, 17 Jun 2019 21:33:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E082320673 for ; Mon, 17 Jun 2019 21:33:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560807236; bh=8+TVsxTNSwBU62ZQcHihgOGH+kHg8CanZEKllqlIRQM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SKg0Hf1qkuhZFAz02lbbNAD2EDaNHyTC2DGxM6SpSEi58f7zNM9tA6WheNMQIwAP/ vr4bk6q7XWdbB4oIfIcSqIEmk2/DdSUSBJNA2Cyty1rNBRanBZ5VkFBxb4E4dtK2l4 K5ShnVqhzKX1suwdX6Zntx7dCeRvqSWjabdg8V04= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729715AbfFQVZf (ORCPT ); Mon, 17 Jun 2019 17:25:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:51716 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730087AbfFQVZd (ORCPT ); Mon, 17 Jun 2019 17:25:33 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3961320673; Mon, 17 Jun 2019 21:25:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560806732; bh=8+TVsxTNSwBU62ZQcHihgOGH+kHg8CanZEKllqlIRQM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CrWBY2YuNkW2z/nyBR0qD1oeDEyjNG3L9wRNY7q8Ow0jC9U0F0bPweyVosIMDnj0i jOYrJT5x7DBducERyAZvEAE3vnuWwe+LtCLrt/SoSV0vVN+Yov3EokzexkfryZ7kDJ /+U4E+UG5hKaAD5M3rnKiIsHhef+OLYXmiiydEPc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christoph Hellwig , Keith Busch , Chaitanya Kulkarni , Sasha Levin Subject: [PATCH 4.19 39/75] nvme: fix srcu locking on error return in nvme_get_ns_from_disk Date: Mon, 17 Jun 2019 23:09:50 +0200 Message-Id: <20190617210754.286771939@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190617210752.799453599@linuxfoundation.org> References: <20190617210752.799453599@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ Upstream commit 100c815cbd56480b3e31518475b04719c363614a ] If we can't get a namespace don't leak the SRCU lock. nvme_ioctl was working around this, but nvme_pr_command wasn't handling this properly. Just do what callers would usually expect. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Chaitanya Kulkarni Signed-off-by: Sasha Levin --- drivers/nvme/host/core.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index abfb46378cc1..44d8077fbe95 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -1277,9 +1277,14 @@ static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk, { #ifdef CONFIG_NVME_MULTIPATH if (disk->fops == &nvme_ns_head_ops) { + struct nvme_ns *ns; + *head = disk->private_data; *srcu_idx = srcu_read_lock(&(*head)->srcu); - return nvme_find_path(*head); + ns = nvme_find_path(*head); + if (!ns) + srcu_read_unlock(&(*head)->srcu, *srcu_idx); + return ns; } #endif *head = NULL; @@ -1326,9 +1331,9 @@ static int nvme_ioctl(struct block_device *bdev, fmode_t mode, ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx); if (unlikely(!ns)) - ret = -EWOULDBLOCK; - else - ret = nvme_ns_ioctl(ns, cmd, arg); + return -EWOULDBLOCK; + + ret = nvme_ns_ioctl(ns, cmd, arg); nvme_put_ns_from_disk(head, srcu_idx); return ret; } -- 2.20.1