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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 68624CA9ECB for ; Thu, 31 Oct 2019 05:12:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4A6812067D for ; Thu, 31 Oct 2019 05:12:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726465AbfJaFMP (ORCPT ); Thu, 31 Oct 2019 01:12:15 -0400 Received: from esa4.microchip.iphmx.com ([68.232.154.123]:38896 "EHLO esa4.microchip.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726312AbfJaFMO (ORCPT ); Thu, 31 Oct 2019 01:12:14 -0400 Received-SPF: Pass (esa4.microchip.iphmx.com: domain of viswas.g@microsemi.com designates 208.19.100.23 as permitted sender) identity=mailfrom; client-ip=208.19.100.23; receiver=esa4.microchip.iphmx.com; envelope-from="viswas.g@microsemi.com"; x-sender="viswas.g@microsemi.com"; x-conformance=spf_only; x-record-type="v=spf1"; x-record-text="v=spf1 ip4:208.19.100.20 ip4:208.19.100.21 ip4:208.19.100.22 ip4:208.19.100.23 ip4:208.19.99.221 ip4:208.19.99.222 ip4:208.19.99.223 ip4:208.19.99.225 -all" Received-SPF: None (esa4.microchip.iphmx.com: no sender authenticity information available from domain of postmaster@smtp.microsemi.com) identity=helo; client-ip=208.19.100.23; receiver=esa4.microchip.iphmx.com; envelope-from="viswas.g@microsemi.com"; x-sender="postmaster@smtp.microsemi.com"; x-conformance=spf_only Authentication-Results: esa4.microchip.iphmx.com; dkim=none (message not signed) header.i=none; spf=Pass smtp.mailfrom=viswas.g@microsemi.com; spf=None smtp.helo=postmaster@smtp.microsemi.com; dmarc=fail (p=none dis=none) d=microchip.com IronPort-SDR: U0YxOlgpBRy0HmlFSZk03mnKmmxvT90zoRKUVlynMPoCnzv7kGTPLAj+8IABsTGoAd68bFuYF9 Qd221VrtqQHU0zOmg4ZPDjxhLXmkntOx0rEJ3RkBPlm/43PhJhJa4ooA9HrYYphF0SdabZALyk L+bVz7rv4n6Cdyv/ngYLk7IihsPF54UkK9t3JJGWI3VDJgQ+HTZRaQ9cnktXunUllBxjazfMM8 KMURXGPoVjj+VAK6Ax2iVpuEzgyIy/yif4ZTeh0YLnhgf9+KgEI7O5MxLN4pkWbGo07ZA4/ESy eeo= X-IronPort-AV: E=Sophos;i="5.68,250,1569308400"; d="scan'208";a="53588627" Received: from unknown (HELO smtp.microsemi.com) ([208.19.100.23]) by esa4.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 30 Oct 2019 22:12:14 -0700 Received: from AVMBX1.microsemi.net (10.100.34.31) by AVMBX3.microsemi.net (10.100.34.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1847.3; Wed, 30 Oct 2019 22:12:13 -0700 Received: from localhost (10.41.130.49) by avmbx1.microsemi.net (10.100.34.31) with Microsoft SMTP Server id 15.1.1847.3 via Frontend Transport; Wed, 30 Oct 2019 22:12:13 -0700 From: Deepak Ukey To: CC: , , , , , , , , Subject: [PATCH 06/12] pm80xx : Fix dereferencing dangling pointer. Date: Thu, 31 Oct 2019 10:42:35 +0530 Message-ID: <20191031051241.6762-7-deepak.ukey@microchip.com> X-Mailer: git-send-email 2.19.0-rc1 In-Reply-To: <20191031051241.6762-1-deepak.ukey@microchip.com> References: <20191031051241.6762-1-deepak.ukey@microchip.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Vikram Auradkar sas_task structure should not be used after task_done is called. If the device is gone or not attached, we call task_done on t and continue to use in the sas_task in rest of the function. task_done is pointing to sas_ata_task_done, may free the memory associated with the task before returning. Signed-off-by: Vikram Auradkar Signed-off-by: Deepak Ukey Signed-off-by: Viswas G --- drivers/scsi/pm8001/pm8001_sas.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c index 447a66d60275..4491de8d40fc 100644 --- a/drivers/scsi/pm8001/pm8001_sas.c +++ b/drivers/scsi/pm8001/pm8001_sas.c @@ -388,6 +388,7 @@ static int pm8001_task_exec(struct sas_task *task, struct pm8001_ccb_info *ccb; u32 tag = 0xdeadbeef, rc = 0, n_elem = 0; unsigned long flags = 0; + enum sas_protocol task_proto = t->task_proto; if (!dev->port) { struct task_status_struct *tsm = &t->task_status; @@ -412,7 +413,7 @@ static int pm8001_task_exec(struct sas_task *task, pm8001_dev = dev->lldd_dev; port = &pm8001_ha->port[sas_find_local_port_id(dev)]; if (DEV_IS_GONE(pm8001_dev) || !port->port_attached) { - if (sas_protocol_ata(t->task_proto)) { + if (sas_protocol_ata(task_proto)) { struct task_status_struct *ts = &t->task_status; ts->resp = SAS_TASK_UNDELIVERED; ts->stat = SAS_PHY_DOWN; @@ -434,7 +435,7 @@ static int pm8001_task_exec(struct sas_task *task, goto err_out; ccb = &pm8001_ha->ccb_info[tag]; - if (!sas_protocol_ata(t->task_proto)) { + if (!sas_protocol_ata(task_proto)) { if (t->num_scatter) { n_elem = dma_map_sg(pm8001_ha->dev, t->scatter, @@ -454,7 +455,7 @@ static int pm8001_task_exec(struct sas_task *task, ccb->ccb_tag = tag; ccb->task = t; ccb->device = pm8001_dev; - switch (t->task_proto) { + switch (task_proto) { case SAS_PROTOCOL_SMP: rc = pm8001_task_prep_smp(pm8001_ha, ccb); break; @@ -471,8 +472,7 @@ static int pm8001_task_exec(struct sas_task *task, break; default: dev_printk(KERN_ERR, pm8001_ha->dev, - "unknown sas_task proto: 0x%x\n", - t->task_proto); + "unknown sas_task proto: 0x%x\n", task_proto); rc = -EINVAL; break; } @@ -495,7 +495,7 @@ static int pm8001_task_exec(struct sas_task *task, pm8001_tag_free(pm8001_ha, tag); err_out: dev_printk(KERN_ERR, pm8001_ha->dev, "pm8001 exec failed[%d]!\n", rc); - if (!sas_protocol_ata(t->task_proto)) + if (!sas_protocol_ata(task_proto)) if (n_elem) dma_unmap_sg(pm8001_ha->dev, t->scatter, t->num_scatter, t->data_dir); -- 2.16.3