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 A86B1C4321E for ; Mon, 13 Dec 2021 10:03:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241016AbhLMKCz (ORCPT ); Mon, 13 Dec 2021 05:02:55 -0500 Received: from ams.source.kernel.org ([145.40.68.75]:44312 "EHLO ams.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239697AbhLMJ5q (ORCPT ); Mon, 13 Dec 2021 04:57:46 -0500 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 ams.source.kernel.org (Postfix) with ESMTPS id F1D30B80E76; Mon, 13 Dec 2021 09:57:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 79DBCC34600; Mon, 13 Dec 2021 09:57:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1639389462; bh=gBMK9NaWjKT3OgD+w9CTG/rFha2dHXnb+Hp1/HwWpmY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VSweljy4aSHX/tHOWsuf6TqVdm8qCDajhOJQLlkxr+vYFIvN+6slGPSBggoMP5d2K Ol6WrebDpNEtbdQ7dJGOGG8lUVGykW7ncSdk0bRwwDXhg5YsSIi1HHuVxZdsX/KD/d KR1nTrWAR4xq9oQ+jakUpSKcRSJjMDavDSYQf2ic= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vishakha Channapattan , Jack Wang , Igor Pylypiv , "Martin K. Petersen" Subject: [PATCH 5.15 103/171] scsi: pm80xx: Do not call scsi_remove_host() in pm8001_alloc() Date: Mon, 13 Dec 2021 10:30:18 +0100 Message-Id: <20211213092948.520204907@linuxfoundation.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211213092945.091487407@linuxfoundation.org> References: <20211213092945.091487407@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Igor Pylypiv commit 653926205741add87a6cf452e21950eebc6ac10b upstream. Calling scsi_remove_host() before scsi_add_host() results in a crash: BUG: kernel NULL pointer dereference, address: 0000000000000108 RIP: 0010:device_del+0x63/0x440 Call Trace: device_unregister+0x17/0x60 scsi_remove_host+0xee/0x2a0 pm8001_pci_probe+0x6ef/0x1b90 [pm80xx] local_pci_probe+0x3f/0x90 We cannot call scsi_remove_host() in pm8001_alloc() because scsi_add_host() has not been called yet at that point in time. Function call tree: pm8001_pci_probe() | `- pm8001_pci_alloc() | | | `- pm8001_alloc() | | | `- scsi_remove_host() | `- scsi_add_host() Link: https://lore.kernel.org/r/20211201041627.1592487-1-ipylypiv@google.com Fixes: 05c6c029a44d ("scsi: pm80xx: Increase number of supported queues") Reviewed-by: Vishakha Channapattan Acked-by: Jack Wang Signed-off-by: Igor Pylypiv Signed-off-by: Martin K. Petersen Signed-off-by: Greg Kroah-Hartman --- drivers/scsi/pm8001/pm8001_init.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) --- a/drivers/scsi/pm8001/pm8001_init.c +++ b/drivers/scsi/pm8001/pm8001_init.c @@ -281,12 +281,12 @@ static int pm8001_alloc(struct pm8001_hb if (rc) { pm8001_dbg(pm8001_ha, FAIL, "pm8001_setup_irq failed [ret: %d]\n", rc); - goto err_out_shost; + goto err_out; } /* Request Interrupt */ rc = pm8001_request_irq(pm8001_ha); if (rc) - goto err_out_shost; + goto err_out; count = pm8001_ha->max_q_num; /* Queues are chosen based on the number of cores/msix availability */ @@ -422,8 +422,6 @@ static int pm8001_alloc(struct pm8001_hb pm8001_tag_init(pm8001_ha); return 0; -err_out_shost: - scsi_remove_host(pm8001_ha->shost); err_out_nodev: for (i = 0; i < pm8001_ha->max_memcnt; i++) { if (pm8001_ha->memoryMap.region[i].virt_ptr != NULL) {