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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 88468C433EB for ; Mon, 22 Mar 2021 12:48:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 64292619B2 for ; Mon, 22 Mar 2021 12:48:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231854AbhCVMqx (ORCPT ); Mon, 22 Mar 2021 08:46:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:58570 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231657AbhCVMil (ORCPT ); Mon, 22 Mar 2021 08:38:41 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id A79B761931; Mon, 22 Mar 2021 12:37:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1616416671; bh=JocfG6KJGfFGtY9reXX4CgCm+UnePnSPZ75dnzv8H/I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d980WvHmg+/mRa4ES6zSSk9IJ3mt6GEiSVJwfH53Sk8Pk2jmareVeqS+JteBuresV HLQ6D91LxNUvJ0F+hV0IUrFs+dOaMWIglkTiqP5+7FBE+TQ3RD4zOJj0od9+930lad jyfYEAoTrowv8BfGcI/5Twb7BCleaj8rLQDdEfTg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jack Wang , yuuzheng , Viswas G , Ruksar Devadi , Radha Ramachandran , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 5.10 077/157] scsi: pm80xx: Fix pm8001_mpi_get_nvmd_resp() race condition Date: Mon, 22 Mar 2021 13:27:14 +0100 Message-Id: <20210322121936.207738576@linuxfoundation.org> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20210322121933.746237845@linuxfoundation.org> References: <20210322121933.746237845@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: yuuzheng [ Upstream commit 1f889b58716a5f5e3e4fe0e6742c1a4472f29ac1 ] A use-after-free or null-pointer error occurs when the 251-byte response data is copied from IOMB buffer to response message buffer in function pm8001_mpi_get_nvmd_resp(). After sending the command get_nvmd_data(), the caller begins to sleep by calling wait_for_complete() and waits for the wake-up from calling complete() in pm8001_mpi_get_nvmd_resp(). Due to unexpected events (e.g., interrupt), if response buffer gets freed before memcpy(), a use-after-free error will occur. To fix this, the complete() should be called after memcpy(). Link: https://lore.kernel.org/r/20201102165528.26510-5-Viswas.G@microchip.com.com Acked-by: Jack Wang Signed-off-by: yuuzheng Signed-off-by: Viswas G Signed-off-by: Ruksar Devadi Signed-off-by: Radha Ramachandran Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/pm8001/pm8001_hwi.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/pm8001/pm8001_hwi.c b/drivers/scsi/pm8001/pm8001_hwi.c index 9e9a546da959..2054c2b03d92 100644 --- a/drivers/scsi/pm8001/pm8001_hwi.c +++ b/drivers/scsi/pm8001/pm8001_hwi.c @@ -3279,10 +3279,15 @@ pm8001_mpi_get_nvmd_resp(struct pm8001_hba_info *pm8001_ha, void *piomb) pm8001_ha->memoryMap.region[NVMD].virt_ptr, fw_control_context->len); kfree(ccb->fw_control_context); + /* To avoid race condition, complete should be + * called after the message is copied to + * fw_control_context->usrAddr + */ + complete(pm8001_ha->nvmd_completion); + PM8001_MSG_DBG(pm8001_ha, pm8001_printk("Set nvm data complete!\n")); ccb->task = NULL; ccb->ccb_tag = 0xFFFFFFFF; pm8001_tag_free(pm8001_ha, tag); - complete(pm8001_ha->nvmd_completion); } int pm8001_mpi_local_phy_ctl(struct pm8001_hba_info *pm8001_ha, void *piomb) -- 2.30.1