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 28C07E95A8E for ; Mon, 9 Oct 2023 13:24:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376605AbjJINYc (ORCPT ); Mon, 9 Oct 2023 09:24:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55930 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376653AbjJINYb (ORCPT ); Mon, 9 Oct 2023 09:24:31 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C3358A3 for ; Mon, 9 Oct 2023 06:24:28 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 119F8C433C7; Mon, 9 Oct 2023 13:24:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1696857868; bh=Vq4i7G52bOZ2sde8rfuv6QuQDNt8s7Uf5EkwS0qgVNc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aXAhVuKxganoj+sXWy7uWlbrWlBzZxi/O2IsgEaoY1ri28CepSPgkBaq4jjUt91GN w8EcwRY+tJQD0bX2hOEWxA0nYOXxlYLRpiu+/xoB/h4ZqlzSM5UjauxwOxFuuKfMSe hInW4/XqFZrpMxaNMXhG8zz4DaIxg1A12iniKXSw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dinghao Liu , Benjamin Block , "Martin K. Petersen" Subject: [PATCH 5.15 19/75] scsi: zfcp: Fix a double put in zfcp_port_enqueue() Date: Mon, 9 Oct 2023 15:01:41 +0200 Message-ID: <20231009130111.906499457@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231009130111.200710898@linuxfoundation.org> References: <20231009130111.200710898@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dinghao Liu commit b481f644d9174670b385c3a699617052cd2a79d3 upstream. When device_register() fails, zfcp_port_release() will be called after put_device(). As a result, zfcp_ccw_adapter_put() will be called twice: one in zfcp_port_release() and one in the error path after device_register(). So the reference on the adapter object is doubly put, which may lead to a premature free. Fix this by adjusting the error tag after device_register(). Fixes: f3450c7b9172 ("[SCSI] zfcp: Replace local reference counting with common kref") Signed-off-by: Dinghao Liu Link: https://lore.kernel.org/r/20230923103723.10320-1-dinghao.liu@zju.edu.cn Acked-by: Benjamin Block Cc: stable@vger.kernel.org # v2.6.33+ Signed-off-by: Martin K. Petersen Signed-off-by: Greg Kroah-Hartman --- drivers/s390/scsi/zfcp_aux.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) --- a/drivers/s390/scsi/zfcp_aux.c +++ b/drivers/s390/scsi/zfcp_aux.c @@ -518,12 +518,12 @@ struct zfcp_port *zfcp_port_enqueue(stru if (port) { put_device(&port->dev); retval = -EEXIST; - goto err_out; + goto err_put; } port = kzalloc(sizeof(struct zfcp_port), GFP_KERNEL); if (!port) - goto err_out; + goto err_put; rwlock_init(&port->unit_list_lock); INIT_LIST_HEAD(&port->unit_list); @@ -546,7 +546,7 @@ struct zfcp_port *zfcp_port_enqueue(stru if (dev_set_name(&port->dev, "0x%016llx", (unsigned long long)wwpn)) { kfree(port); - goto err_out; + goto err_put; } retval = -EINVAL; @@ -563,7 +563,8 @@ struct zfcp_port *zfcp_port_enqueue(stru return port; -err_out: +err_put: zfcp_ccw_adapter_put(adapter); +err_out: return ERR_PTR(retval); }