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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 DC265C32750 for ; Fri, 2 Aug 2019 13:22:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B437A21871 for ; Fri, 2 Aug 2019 13:22:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564752146; bh=8G0xjL5wX9rZT733svEXgWfiwMIBLWzgUjruXDyMgRs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=HWaEiNOX4doxVOcosVxsDxbg3fukQnzw1AkGCzj1BwIrcbvELxqU0CZ9UyjlRffko OjfdLR4k5aHT2l3weLPoPJ/UcaGrWXqhs9TMkTuQh1vafW99CMDgd6obWbFHWE9vog 1lbrM/mLTqOZ4x3q3BbDbJztDsFzwGwWyclbbOWg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393765AbfHBNWZ (ORCPT ); Fri, 2 Aug 2019 09:22:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:60988 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2393726AbfHBNWX (ORCPT ); Fri, 2 Aug 2019 09:22:23 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 396C3217D4; Fri, 2 Aug 2019 13:22:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564752143; bh=8G0xjL5wX9rZT733svEXgWfiwMIBLWzgUjruXDyMgRs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=b5BU2tSRAjG7mBaSBHlGvHHcVtNCREjq6aY9HQWlQzHu5emRvuM3VPaxh/0KXIulC DGJwYTRN5oatiAdaiLXYqJbaOsUHxHJBsTqI/b7EMe3WNR7JmStrm04Gx1Smwal8f/ R8ghwgtP1573GZh6/gWUwo1IwqExj13ujsD8siCY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Logan Gunthorpe , Sagi Grimberg , Christoph Hellwig , Sasha Levin , linux-nvme@lists.infradead.org Subject: [PATCH AUTOSEL 5.2 60/76] nvme: fix memory leak caused by incorrect subsystem free Date: Fri, 2 Aug 2019 09:19:34 -0400 Message-Id: <20190802131951.11600-60-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190802131951.11600-1-sashal@kernel.org> References: <20190802131951.11600-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Logan Gunthorpe [ Upstream commit e654dfd38c1ecf58d8d019f3c053189413484a5b ] When freeing the subsystem after finding another match with __nvme_find_get_subsystem(), use put_device() instead of __nvme_release_subsystem() which calls kfree() directly. Per the documentation, put_device() should always be used after device_initialization() is called. Otherwise, leaks like the one below which was detected by kmemleak may occur. Once the call of __nvme_release_subsystem() is removed it no longer makes sense to keep the helper, so fold it back into nvme_release_subsystem(). unreferenced object 0xffff8883d12bfbc0 (size 16): comm "nvme", pid 2635, jiffies 4294933602 (age 739.952s) hex dump (first 16 bytes): 6e 76 6d 65 2d 73 75 62 73 79 73 32 00 88 ff ff nvme-subsys2.... backtrace: [<000000007d8fc208>] __kmalloc_track_caller+0x16d/0x2a0 [<0000000081169e5f>] kvasprintf+0xad/0x130 [<0000000025626f25>] kvasprintf_const+0x47/0x120 [<00000000fa66ad36>] kobject_set_name_vargs+0x44/0x120 [<000000004881f8b3>] dev_set_name+0x98/0xc0 [<000000007124dae3>] nvme_init_identify+0x1995/0x38e0 [<000000009315020a>] nvme_loop_configure_admin_queue+0x4fa/0x5e0 [<000000001a63e766>] nvme_loop_create_ctrl+0x489/0xf80 [<00000000a46ecc23>] nvmf_dev_write+0x1a12/0x2220 [<000000002259b3d5>] __vfs_write+0x66/0x120 [<000000002f6df81e>] vfs_write+0x154/0x490 [<000000007e8cfc19>] ksys_write+0x10a/0x240 [<00000000ff5c7b85>] __x64_sys_write+0x73/0xb0 [<00000000fee6d692>] do_syscall_64+0xaa/0x470 [<00000000997e1ede>] entry_SYSCALL_64_after_hwframe+0x49/0xbe Fixes: ab9e00cc72fa ("nvme: track subsystems") Signed-off-by: Logan Gunthorpe Reviewed-by: Sagi Grimberg Signed-off-by: Christoph Hellwig Signed-off-by: Sasha Levin --- drivers/nvme/host/core.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 4a1d2ab4d1612..5deb4deb38209 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -2264,17 +2264,15 @@ static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ct memset(subsys->subnqn + off, 0, sizeof(subsys->subnqn) - off); } -static void __nvme_release_subsystem(struct nvme_subsystem *subsys) +static void nvme_release_subsystem(struct device *dev) { + struct nvme_subsystem *subsys = + container_of(dev, struct nvme_subsystem, dev); + ida_simple_remove(&nvme_subsystems_ida, subsys->instance); kfree(subsys); } -static void nvme_release_subsystem(struct device *dev) -{ - __nvme_release_subsystem(container_of(dev, struct nvme_subsystem, dev)); -} - static void nvme_destroy_subsystem(struct kref *ref) { struct nvme_subsystem *subsys = @@ -2429,7 +2427,7 @@ static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) mutex_lock(&nvme_subsystems_lock); found = __nvme_find_get_subsystem(subsys->subnqn); if (found) { - __nvme_release_subsystem(subsys); + put_device(&subsys->dev); subsys = found; if (!nvme_validate_cntlid(subsys, ctrl, id)) { -- 2.20.1