From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A7A4E1D523 for ; Wed, 4 Oct 2023 18:08:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=linuxfoundation.org Received: by smtp.kernel.org (Postfix) with ESMTPSA id 29649C433C7; Wed, 4 Oct 2023 18:08:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1696442930; bh=i05UaYaLvtXq9eZP5u/saFpV7TDtAEF3d2GIZ0qHm+Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0Afg/UnofKGbNuNogd/24LGB11rQduM53wDehLnvc9BXXpzoyVXzuKDwJP9NapQk9 SGxYJ6Vk8Y8MhXME2gm9IqFzcIOjFDOS0qTVlF2cEKXhAFOy4pUEmtldmO8nLzi4kv FDiEZOru3sNMQWkoNQ8JIdEQ2+4LvNXXdQdD1p0c= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Gleb Chesnokov , Himanshu Madhani , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 5.15 152/183] scsi: qla2xxx: Fix NULL pointer dereference in target mode Date: Wed, 4 Oct 2023 19:56:23 +0200 Message-ID: <20231004175210.387671486@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231004175203.943277832@linuxfoundation.org> References: <20231004175203.943277832@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Gleb Chesnokov [ Upstream commit d54820b22e404b06b2b65877ff802cc7b31688bc ] When target mode is enabled, the pci_irq_get_affinity() function may return a NULL value in qla_mapq_init_qp_cpu_map() due to the qla24xx_enable_msix() code that handles IRQ settings for target mode. This leads to a crash due to a NULL pointer dereference. This patch fixes the issue by adding a check for the NULL value returned by pci_irq_get_affinity() and introducing a 'cpu_mapped' boolean flag to the qla_qpair structure, ensuring that the qpair's CPU affinity is updated when it has not been mapped to a CPU. Fixes: 1d201c81d4cc ("scsi: qla2xxx: Select qpair depending on which CPU post_cmd() gets called") Signed-off-by: Gleb Chesnokov Link: https://lore.kernel.org/r/56b416f2-4e0f-b6cf-d6d5-b7c372e3c6a2@scst.dev Reviewed-by: Himanshu Madhani Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/qla2xxx/qla_def.h | 1 + drivers/scsi/qla2xxx/qla_init.c | 3 +++ drivers/scsi/qla2xxx/qla_inline.h | 3 +++ drivers/scsi/qla2xxx/qla_isr.c | 3 +++ 4 files changed, 10 insertions(+) diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h index 723f9953ad701..3c876967e8b16 100644 --- a/drivers/scsi/qla2xxx/qla_def.h +++ b/drivers/scsi/qla2xxx/qla_def.h @@ -3791,6 +3791,7 @@ struct qla_qpair { uint64_t retry_term_jiff; struct qla_tgt_counters tgt_counters; uint16_t cpuid; + bool cpu_mapped; struct qla_fw_resources fwres ____cacheline_aligned; u32 cmd_cnt; u32 cmd_completion_cnt; diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c index d259f6727cf74..b59d5b560a278 100644 --- a/drivers/scsi/qla2xxx/qla_init.c +++ b/drivers/scsi/qla2xxx/qla_init.c @@ -9780,6 +9780,9 @@ struct qla_qpair *qla2xxx_create_qpair(struct scsi_qla_host *vha, int qos, qpair->rsp->req = qpair->req; qpair->rsp->qpair = qpair; + if (!qpair->cpu_mapped) + qla_cpu_update(qpair, raw_smp_processor_id()); + if (IS_T10_PI_CAPABLE(ha) && ql2xenabledif) { if (ha->fw_attributes & BIT_4) qpair->difdix_supported = 1; diff --git a/drivers/scsi/qla2xxx/qla_inline.h b/drivers/scsi/qla2xxx/qla_inline.h index e66441355f7ae..a4a56ab0ba747 100644 --- a/drivers/scsi/qla2xxx/qla_inline.h +++ b/drivers/scsi/qla2xxx/qla_inline.h @@ -597,11 +597,14 @@ qla_mapq_init_qp_cpu_map(struct qla_hw_data *ha, if (!ha->qp_cpu_map) return; mask = pci_irq_get_affinity(ha->pdev, msix->vector_base0); + if (!mask) + return; qpair->cpuid = cpumask_first(mask); for_each_cpu(cpu, mask) { ha->qp_cpu_map[cpu] = qpair; } msix->cpuid = qpair->cpuid; + qpair->cpu_mapped = true; } static inline void diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c index 4f6aab2599350..51e906fa8694e 100644 --- a/drivers/scsi/qla2xxx/qla_isr.c +++ b/drivers/scsi/qla2xxx/qla_isr.c @@ -3782,6 +3782,9 @@ void qla24xx_process_response_queue(struct scsi_qla_host *vha, if (rsp->qpair->cpuid != raw_smp_processor_id() || !rsp->qpair->rcv_intr) { rsp->qpair->rcv_intr = 1; + + if (!rsp->qpair->cpu_mapped) + qla_cpu_update(rsp->qpair, raw_smp_processor_id()); } #define __update_rsp_in(_update, _is_shadow_hba, _rsp, _rsp_in) \ -- 2.40.1