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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 95FE1C83004 for ; Tue, 28 Apr 2020 19:00:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7279920575 for ; Tue, 28 Apr 2020 19:00:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588100431; bh=ZiUdqKospF+UNT9RUZ6+tHc5LkH7Gx4VOkmKVEXiG4A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=JjWMjWgyxB4KSj8Bd4csxfv1Mc55YbkCFzUV0e8o2Ze915b2cM2wS6Mo6MJwiDsP2 p8v2ko2CHkPQWQgTDq0c4i5PrZJKRXRtt7lTs+acnM6sj5U03RkK5Nky33jws/Htuz y/x9iZrCgeqHipTLx6nkeZg0HrpDcBLdK0mwfsxU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728980AbgD1S11 (ORCPT ); Tue, 28 Apr 2020 14:27:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:39432 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728949AbgD1S1T (ORCPT ); Tue, 28 Apr 2020 14:27:19 -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 C4F85208E0; Tue, 28 Apr 2020 18:27:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588098439; bh=ZiUdqKospF+UNT9RUZ6+tHc5LkH7Gx4VOkmKVEXiG4A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bmOiyJegdX/t3ss0NlRmbqzhtdIMQQRhgSdIU5/jBy5la1TmrhiSVr4LdUMmhUDSp Mcnn72qEUQamvl9KQP7tij67cynJfSnVqL1NIYmXJCcQjdQIvjKRDq5adf43LnVTeM HM/0ZFVb9Ui8fyCJZClWNco0f49ObuIcpoGZYKtE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, James Smart , Dick Kennedy , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 5.6 007/167] scsi: lpfc: Fix crash in target side cable pulls hitting WAIT_FOR_UNREG Date: Tue, 28 Apr 2020 20:23:03 +0200 Message-Id: <20200428182226.179126653@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200428182225.451225420@linuxfoundation.org> References: <20200428182225.451225420@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: James Smart [ Upstream commit 807e7353d8a7105ce884d22b0dbc034993c6679c ] Kernel is crashing with the following stacktrace: BUG: unable to handle kernel NULL pointer dereference at 00000000000005bc IP: lpfc_nvme_register_port+0x1a8/0x3a0 [lpfc] ... Call Trace: lpfc_nlp_state_cleanup+0x2b2/0x500 [lpfc] lpfc_nlp_set_state+0xd7/0x1a0 [lpfc] lpfc_cmpl_prli_prli_issue+0x1f7/0x450 [lpfc] lpfc_disc_state_machine+0x7a/0x1e0 [lpfc] lpfc_cmpl_els_prli+0x16f/0x1e0 [lpfc] lpfc_sli_sp_handle_rspiocb+0x5b2/0x690 [lpfc] lpfc_sli_handle_slow_ring_event_s4+0x182/0x230 [lpfc] lpfc_do_work+0x87f/0x1570 [lpfc] kthread+0x10d/0x130 ret_from_fork+0x35/0x40 During target side fault injections, it is possible to hit the NLP_WAIT_FOR_UNREG case in lpfc_nvme_remoteport_delete. A prior commit fixed a rebind and delete race condition, but called lpfc_nlp_put unconditionally. This triggered a deletion and the crash. Fix by movng nlp_put to inside the NLP_WAIT_FOR_UNREG case, where the nlp will be being unregistered/removed. Leave the reference if the flag isn't set. Link: https://lore.kernel.org/r/20200322181304.37655-8-jsmart2021@gmail.com Fixes: b15bd3e6212e ("scsi: lpfc: Fix nvme remoteport registration race conditions") Signed-off-by: James Smart Signed-off-by: Dick Kennedy Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/lpfc/lpfc_nvme.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_nvme.c b/drivers/scsi/lpfc/lpfc_nvme.c index db4a04a207ece..cb40217d5cc14 100644 --- a/drivers/scsi/lpfc/lpfc_nvme.c +++ b/drivers/scsi/lpfc/lpfc_nvme.c @@ -382,13 +382,15 @@ lpfc_nvme_remoteport_delete(struct nvme_fc_remote_port *remoteport) if (ndlp->upcall_flags & NLP_WAIT_FOR_UNREG) { ndlp->nrport = NULL; ndlp->upcall_flags &= ~NLP_WAIT_FOR_UNREG; - } - spin_unlock_irq(&vport->phba->hbalock); + spin_unlock_irq(&vport->phba->hbalock); - /* Remove original register reference. The host transport - * won't reference this rport/remoteport any further. - */ - lpfc_nlp_put(ndlp); + /* Remove original register reference. The host transport + * won't reference this rport/remoteport any further. + */ + lpfc_nlp_put(ndlp); + } else { + spin_unlock_irq(&vport->phba->hbalock); + } rport_err: return; -- 2.20.1