From patchwork Sat May 9 02:26:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaumik Bhatt X-Patchwork-Id: 189225 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=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 05A5BC47247 for ; Sat, 9 May 2020 02:27:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D25C12192A for ; Sat, 9 May 2020 02:27:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="ZEKYBEj+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728707AbgEIC1T (ORCPT ); Fri, 8 May 2020 22:27:19 -0400 Received: from mail26.static.mailgun.info ([104.130.122.26]:43393 "EHLO mail26.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728662AbgEIC1H (ORCPT ); Fri, 8 May 2020 22:27:07 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1588991226; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=yQPyjhWO4IzWNgBlXCH4ez/ff7ca0LWqm0O6ayE2m4w=; b=ZEKYBEj+RTVYuUMwKotuZ+kzjcRad/RIzkeKr2PI81Tx/uBQmrlFzUVaUkzx6cHBoXtXNHxi gk8rU8W923Ufy+d5XDp5cVlsuz/zy4EDqx5EOmdrb05yZa4Q3aj3/cLXpS3euwDKtD42eYP3 diCY4+bCg3syt6QjH7Pempz1N4o= X-Mailgun-Sending-Ip: 104.130.122.26 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by mxa.mailgun.org with ESMTP id 5eb614f2.7f0129019d18-smtp-out-n01; Sat, 09 May 2020 02:26:58 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id A1DE8C433D2; Sat, 9 May 2020 02:26:57 +0000 (UTC) Received: from bbhatt-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: bbhatt) by smtp.codeaurora.org (Postfix) with ESMTPSA id 1001DC43637; Sat, 9 May 2020 02:26:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 1001DC43637 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=bbhatt@codeaurora.org From: Bhaumik Bhatt To: manivannan.sadhasivam@linaro.org Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, hemantk@codeaurora.org, jhugo@codeaurora.org, Bhaumik Bhatt Subject: [PATCH v7 3/8] bus: mhi: core: Add range check for channel id received in event ring Date: Fri, 8 May 2020 19:26:43 -0700 Message-Id: <1588991208-26928-4-git-send-email-bbhatt@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1588991208-26928-1-git-send-email-bbhatt@codeaurora.org> References: <1588991208-26928-1-git-send-email-bbhatt@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Hemant Kumar MHI data completion handler function reads channel id from event ring element. Value is under the control of MHI devices and can be any value between 0 and 255. In order to prevent out of bound access add a bound check against the max channel supported by controller and skip processing of that event ring element. Signed-off-by: Hemant Kumar Signed-off-by: Bhaumik Bhatt Reviewed-by: Jeffrey Hugo --- drivers/bus/mhi/core/main.c | 40 +++++++++++++++++++++++++++++----------- 1 file changed, 29 insertions(+), 11 deletions(-) diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 605640c..30798ec 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -775,9 +775,18 @@ int mhi_process_ctrl_ev_ring(struct mhi_controller *mhi_cntrl, } case MHI_PKT_TYPE_TX_EVENT: chan = MHI_TRE_GET_EV_CHID(local_rp); - mhi_chan = &mhi_cntrl->mhi_chan[chan]; - parse_xfer_event(mhi_cntrl, local_rp, mhi_chan); - event_quota--; + + WARN_ON(chan >= mhi_cntrl->max_chan); + + /* + * Only process the event ring elements whose channel + * ID is within the maximum supported range. + */ + if (chan < mhi_cntrl->max_chan) { + mhi_chan = &mhi_cntrl->mhi_chan[chan]; + parse_xfer_event(mhi_cntrl, local_rp, mhi_chan); + event_quota--; + } break; default: dev_err(dev, "Unhandled event type: %d\n", type); @@ -820,14 +829,23 @@ int mhi_process_data_event_ring(struct mhi_controller *mhi_cntrl, enum mhi_pkt_type type = MHI_TRE_GET_EV_TYPE(local_rp); chan = MHI_TRE_GET_EV_CHID(local_rp); - mhi_chan = &mhi_cntrl->mhi_chan[chan]; - - if (likely(type == MHI_PKT_TYPE_TX_EVENT)) { - parse_xfer_event(mhi_cntrl, local_rp, mhi_chan); - event_quota--; - } else if (type == MHI_PKT_TYPE_RSC_TX_EVENT) { - parse_rsc_event(mhi_cntrl, local_rp, mhi_chan); - event_quota--; + + WARN_ON(chan >= mhi_cntrl->max_chan); + + /* + * Only process the event ring elements whose channel + * ID is within the maximum supported range. + */ + if (chan < mhi_cntrl->max_chan) { + mhi_chan = &mhi_cntrl->mhi_chan[chan]; + + if (likely(type == MHI_PKT_TYPE_TX_EVENT)) { + parse_xfer_event(mhi_cntrl, local_rp, mhi_chan); + event_quota--; + } else if (type == MHI_PKT_TYPE_RSC_TX_EVENT) { + parse_rsc_event(mhi_cntrl, local_rp, mhi_chan); + event_quota--; + } } mhi_recycle_ev_ring_element(mhi_cntrl, ev_ring);