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=-13.1 required=3.0 tests=BAYES_00,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=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 0D06CC433DF for ; Fri, 21 Aug 2020 16:33:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D8FAA207BB for ; Fri, 21 Aug 2020 16:33:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598027618; bh=lhPzxAMtGiGwqFgokTYuR2htwCTnKmFaZukK5H3J0RU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=fgVgzLrp/mOrd5vBHiCApzhYi/BqI/1dt0nkv4DCPOsxaKw65MxN0OEHlxe8bx1rS 7D2NzGOKCl5EZoBn4NH3lq70adYe+JQcC8vdUHWfzndhJudh2lSs4qBr4svIX4m3Lp UtzjGjEYRBG8kFHPkfV+j/RztXZcvyeDJdwRkDuQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728563AbgHUQdf (ORCPT ); Fri, 21 Aug 2020 12:33:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:50212 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726734AbgHUQVb (ORCPT ); Fri, 21 Aug 2020 12:21:31 -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 1F7FC207BB; Fri, 21 Aug 2020 16:20:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598026831; bh=lhPzxAMtGiGwqFgokTYuR2htwCTnKmFaZukK5H3J0RU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=N7FXC1o0yxNcLIkolrPkLoD37W14+I9u3cnoEg4nHd6MQbBrLRI+Hq477SpzCER62 enMwmRWDHe7cx75OHxV84YjqN1clrAryd8XGyMY3btr5V0LhgTBmRNMwgcr2qQypIe bRYC//T0YvXYNp+DT4oDU7GS1Hw+1Q893fE1Fndk= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Qiushi Wu , Bjorn Helgaas , Sasha Levin , linux-pci@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 13/22] PCI: Fix pci_create_slot() reference count leak Date: Fri, 21 Aug 2020 12:20:05 -0400 Message-Id: <20200821162014.349506-13-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200821162014.349506-1-sashal@kernel.org> References: <20200821162014.349506-1-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: Qiushi Wu [ Upstream commit 8a94644b440eef5a7b9c104ac8aa7a7f413e35e5 ] kobject_init_and_add() takes a reference even when it fails. If it returns an error, kobject_put() must be called to clean up the memory associated with the object. When kobject_init_and_add() fails, call kobject_put() instead of kfree(). b8eb718348b8 ("net-sysfs: Fix reference count leak in rx|netdev_queue_add_kobject") fixed a similar problem. Link: https://lore.kernel.org/r/20200528021322.1984-1-wu000273@umn.edu Signed-off-by: Qiushi Wu Signed-off-by: Bjorn Helgaas Signed-off-by: Sasha Levin --- drivers/pci/slot.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c index 429d34c348b9f..01a343ad7155c 100644 --- a/drivers/pci/slot.c +++ b/drivers/pci/slot.c @@ -303,13 +303,16 @@ struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr, slot_name = make_slot_name(name); if (!slot_name) { err = -ENOMEM; + kfree(slot); goto err; } err = kobject_init_and_add(&slot->kobj, &pci_slot_ktype, NULL, "%s", slot_name); - if (err) + if (err) { + kobject_put(&slot->kobj); goto err; + } INIT_LIST_HEAD(&slot->list); list_add(&slot->list, &parent->slots); @@ -328,7 +331,6 @@ struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr, mutex_unlock(&pci_slot_mutex); return slot; err: - kfree(slot); slot = ERR_PTR(err); goto out; } -- 2.25.1