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 ACD07C761AF for ; Mon, 3 Apr 2023 14:16:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232824AbjDCOQL (ORCPT ); Mon, 3 Apr 2023 10:16:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33820 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232934AbjDCOQK (ORCPT ); Mon, 3 Apr 2023 10:16:10 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B267D4EFD for ; Mon, 3 Apr 2023 07:16:09 -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 dfw.source.kernel.org (Postfix) with ESMTPS id 4D0FD61CC4 for ; Mon, 3 Apr 2023 14:16:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6483FC433EF; Mon, 3 Apr 2023 14:16:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1680531368; bh=KTW5qMXntZFuTO6YrqYXUdEWf8r8SmJgFMJCb5mcpDM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kEFg70q+TVqa8yA/aF/XN4OUNB18RVGzYueY0d7Z64c2Kk80zYL35L+E/Pf2L9Gov Le+jDKDXC2PHHyOvEIx0S5nM5cmfMDd1tVRetba7SYFuEYVRS2TKgfyTKYXdWHPZpq ykeHOxBuN1vF5gRJP5RrYX6VT+zzVz05MBJM0/C4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yu Kuai , Benjamin Block , Bart Van Assche , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 4.19 09/84] scsi: scsi_dh_alua: Fix memleak for qdata in alua_activate() Date: Mon, 3 Apr 2023 16:08:10 +0200 Message-Id: <20230403140353.717880424@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230403140353.406927418@linuxfoundation.org> References: <20230403140353.406927418@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Yu Kuai [ Upstream commit a13faca032acbf2699293587085293bdfaafc8ae ] If alua_rtpg_queue() failed from alua_activate(), then 'qdata' is not freed, which will cause following memleak: unreferenced object 0xffff88810b2c6980 (size 32): comm "kworker/u16:2", pid 635322, jiffies 4355801099 (age 1216426.076s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 40 39 24 c1 ff ff ff ff 00 f8 ea 0a 81 88 ff ff @9$............. backtrace: [<0000000098f3a26d>] alua_activate+0xb0/0x320 [<000000003b529641>] scsi_dh_activate+0xb2/0x140 [<000000007b296db3>] activate_path_work+0xc6/0xe0 [dm_multipath] [<000000007adc9ace>] process_one_work+0x3c5/0x730 [<00000000c457a985>] worker_thread+0x93/0x650 [<00000000cb80e628>] kthread+0x1ba/0x210 [<00000000a1e61077>] ret_from_fork+0x22/0x30 Fix the problem by freeing 'qdata' in error path. Fixes: 625fe857e4fa ("scsi: scsi_dh_alua: Check scsi_device_get() return value") Signed-off-by: Yu Kuai Link: https://lore.kernel.org/r/20230315062154.668812-1-yukuai1@huaweicloud.com Reviewed-by: Benjamin Block Reviewed-by: Bart Van Assche Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/device_handler/scsi_dh_alua.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c index 4cf7c3348bffe..9be913c19a6e0 100644 --- a/drivers/scsi/device_handler/scsi_dh_alua.c +++ b/drivers/scsi/device_handler/scsi_dh_alua.c @@ -1050,10 +1050,12 @@ static int alua_activate(struct scsi_device *sdev, rcu_read_unlock(); mutex_unlock(&h->init_mutex); - if (alua_rtpg_queue(pg, sdev, qdata, true)) + if (alua_rtpg_queue(pg, sdev, qdata, true)) { fn = NULL; - else + } else { + kfree(qdata); err = SCSI_DH_DEV_OFFLINED; + } kref_put(&pg->kref, release_port_group); out: if (fn) -- 2.39.2