From patchwork Sat May 2 02:32:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaumik Bhatt X-Patchwork-Id: 11523565 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8FA3313B2 for ; Sat, 2 May 2020 02:32:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7916F2184D for ; Sat, 2 May 2020 02:32:20 +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="jIsr6M1Z" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726759AbgEBCcS (ORCPT ); Fri, 1 May 2020 22:32:18 -0400 Received: from mail26.static.mailgun.info ([104.130.122.26]:39466 "EHLO mail26.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726387AbgEBCcR (ORCPT ); Fri, 1 May 2020 22:32:17 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1588386737; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=XRUBzTkZMzt3B80yri5EKdFwcdzexhuzoTj3qdX2z3s=; b=jIsr6M1ZGQbeMOgWE6uNazGXrzp9skNbqH4o90nN+0pzBthw/Td92aNWnzLS+s58ovYgCY9A hVJpAKZkGITBohQjcutLFxm8XY6YZcvEGtaVzmOd2Lf+mvFXCTCKcFl5rI2km1oejZlLJTbh LaydSIC8khQ2pcSIVZ84Xcj9PTA= 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 5eacdbb0.7f0f31604298-smtp-out-n01; Sat, 02 May 2020 02:32:16 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 026EBC4478C; Sat, 2 May 2020 02:32:16 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.0 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 DA895C44788; Sat, 2 May 2020 02:32:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org DA895C44788 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: mani@kernel.org Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, hemantk@codeaurora.org, jhugo@codeaurora.org, Bhaumik Bhatt Subject: [PATCH v4 3/8] bus: mhi: core: Add range check for channel id received in event ring Date: Fri, 1 May 2020 19:32:00 -0700 Message-Id: <1588386725-1165-4-git-send-email-bbhatt@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1588386725-1165-1-git-send-email-bbhatt@codeaurora.org> References: <1588386725-1165-1-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 | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 605640c..e60ab21 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -776,6 +776,9 @@ 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]; + if (WARN_ON(chan >= mhi_cntrl->max_chan)) + goto next_event; + parse_xfer_event(mhi_cntrl, local_rp, mhi_chan); event_quota--; break; @@ -784,6 +787,7 @@ int mhi_process_ctrl_ev_ring(struct mhi_controller *mhi_cntrl, break; } +next_event: mhi_recycle_ev_ring_element(mhi_cntrl, ev_ring); local_rp = ev_ring->rp; dev_rp = mhi_to_virtual(ev_ring, er_ctxt->rp); @@ -820,6 +824,9 @@ 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); + if (WARN_ON(chan >= mhi_cntrl->max_chan)) + goto next_event; + mhi_chan = &mhi_cntrl->mhi_chan[chan]; if (likely(type == MHI_PKT_TYPE_TX_EVENT)) { @@ -830,6 +837,7 @@ int mhi_process_data_event_ring(struct mhi_controller *mhi_cntrl, event_quota--; } +next_event: mhi_recycle_ev_ring_element(mhi_cntrl, ev_ring); local_rp = ev_ring->rp; dev_rp = mhi_to_virtual(ev_ring, er_ctxt->rp);