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=-6.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,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 44148C282DD for ; Thu, 23 May 2019 19:17:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 11B9B205ED for ; Thu, 23 May 2019 19:17:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558639068; bh=35Apv3+ZopS6PBybBSOU2LTPrTwq+FlzVf2YA0xTMTU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=m6sxdS73On9I6B0dfHD9szkscAqNUL3+7IkVYZ16RWsS97Qe1KdsON6gK6jwbk+QN 0w8E0CHOVFQN23u5XABnkweKrhbBI4QQjxSaF7D/yhASRVLkTvCbOT/8arvMfNZ4ND lGlmS9FEWgCj0waqvZPLfpPFgsWyoB8Ai2P1N7Eg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389465AbfEWTRk (ORCPT ); Thu, 23 May 2019 15:17:40 -0400 Received: from mail.kernel.org ([198.145.29.99]:52902 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389459AbfEWTRj (ORCPT ); Thu, 23 May 2019 15:17:39 -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 C60C22184E; Thu, 23 May 2019 19:17:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558639059; bh=35Apv3+ZopS6PBybBSOU2LTPrTwq+FlzVf2YA0xTMTU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=N3VbzCej3ymnfitmI9SlJryHejLCtrNZNnu4h8x99NtuXYKx4rzc4FcGf3ZzAKzGK YTsDKGf1GpmJgTzhDhbxSKaP5z0bQbMj7GjbOw+a2JscAP+vaKMoao0NOOtPHLMeY1 C8sNtJTAC2LKw5eDHhKyVqgnRs+xDafp7T1Dnwss= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Yufen Yu , Martin Wilck , Mike Snitzer Subject: [PATCH 4.19 081/114] dm mpath: always free attached_handler_name in parse_path() Date: Thu, 23 May 2019 21:06:20 +0200 Message-Id: <20190523181739.063658133@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190523181731.372074275@linuxfoundation.org> References: <20190523181731.372074275@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 From: Martin Wilck commit 940bc471780b004a5277c1931f52af363c2fc9da upstream. Commit b592211c33f7 ("dm mpath: fix attached_handler_name leak and dangling hw_handler_name pointer") fixed a memory leak for the case where setup_scsi_dh() returns failure. But setup_scsi_dh may return success and not "use" attached_handler_name if the retain_attached_hwhandler flag is not set on the map. As setup_scsi_sh properly "steals" the pointer by nullifying it, freeing it unconditionally in parse_path() is safe. Fixes: b592211c33f7 ("dm mpath: fix attached_handler_name leak and dangling hw_handler_name pointer") Cc: stable@vger.kernel.org Reported-by: Yufen Yu Signed-off-by: Martin Wilck Signed-off-by: Mike Snitzer Signed-off-by: Greg Kroah-Hartman --- drivers/md/dm-mpath.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/md/dm-mpath.c +++ b/drivers/md/dm-mpath.c @@ -892,6 +892,7 @@ static struct pgpath *parse_path(struct if (attached_handler_name || m->hw_handler_name) { INIT_DELAYED_WORK(&p->activate_path, activate_path_work); r = setup_scsi_dh(p->path.dev->bdev, m, &attached_handler_name, &ti->error); + kfree(attached_handler_name); if (r) { dm_put_device(ti, p->path.dev); goto bad; @@ -906,7 +907,6 @@ static struct pgpath *parse_path(struct return p; bad: - kfree(attached_handler_name); free_pgpath(p); return ERR_PTR(r); }