From patchwork Sun Jan 29 13:24:26 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Keeping X-Patchwork-Id: 9544027 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 6E54E60415 for ; Sun, 29 Jan 2017 13:29:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 60234204C1 for ; Sun, 29 Jan 2017 13:29:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 548F527F88; Sun, 29 Jan 2017 13:29:20 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, T_DKIM_INVALID autolearn=no version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 013B2204C1 for ; Sun, 29 Jan 2017 13:29:20 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1cXpXf-000622-NV; Sun, 29 Jan 2017 13:29:15 +0000 Received: from dougal.metanate.com ([90.155.101.14] helo=metanate.com) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cXpUD-0003sA-3K; Sun, 29 Jan 2017 13:25:45 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=simple/simple; d=metanate.com; s=stronger; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From; bh=dNtndhkOga+xyeqg+XAQdQV5XxwIRVJCnV/iLXwuGn8=; b=Oiz5t+woZAURQuDgZqNuBvA1oN2Q0PhkeR/qd4QS/dOdBlO+ecV7/kFm9TOEKIIAUzhLjyrHQRCeSEJcxI/VXBt8MH/YGu0KiwCdunK+pi3QoxGMatPL+1EYJ+/ujsIV22YeZleFL4/6vToj6S8Ht+H6Ron+ngRt1Idl7kOC63519VoUogesu4nN4izXr/qqVnBwZIDCCuQBGclFU2S6yjt8BVvvUrEYf+lMkezt8fx26vyz/YjwGJKaQaI9mehiImwf0cECWRHVtjbPMsyqw+Z9VKjw9en0HidxAKEkduatJWn1OPt8/xL5OlyMWB7PCtK7gjWsJljYxs+iOxr9qQ==; Received: from johnkeeping.plus.com ([81.174.171.191] helo=localhost.localdomain) by shrek.metanate.com with esmtpsa (TLSv1.2:DHE-RSA-AES128-GCM-SHA256:128) (Exim 4.83_RC2) (envelope-from ) id 1cXpTf-000362-4B; Sun, 29 Jan 2017 13:25:07 +0000 From: John Keeping To: Mark Yao Subject: [PATCH v3 06/24] drm/rockchip: dw-mipi-dsi: avoid out-of-bounds read on tx_buf Date: Sun, 29 Jan 2017 13:24:26 +0000 Message-Id: <20170129132444.25251-7-john@metanate.com> X-Mailer: git-send-email 2.11.0.197.gb556de5.dirty In-Reply-To: <20170129132444.25251-1-john@metanate.com> References: <20170129132444.25251-1-john@metanate.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170129_052541_472748_DC032DE0 X-CRM114-Status: UNSURE ( 8.04 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rockchip@lists.infradead.org, John Keeping , Chris Zhong , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP As a side-effect of this, encode the endianness explicitly rather than casting a u16. Signed-off-by: John Keeping Reviewed-by: Chris Zhong --- v3: - Add Chris' Reviewed-by Unchanged in v2 drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c index 4be1ff3a42bb..2e6ad4591ebf 100644 --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c @@ -572,8 +572,13 @@ static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val) static int dw_mipi_dsi_dcs_short_write(struct dw_mipi_dsi *dsi, const struct mipi_dsi_msg *msg) { - const u16 *tx_buf = msg->tx_buf; - u32 val = GEN_HDATA(*tx_buf) | GEN_HTYPE(msg->type); + const u8 *tx_buf = msg->tx_buf; + u32 val = GEN_HTYPE(msg->type); + + if (msg->tx_len > 0) + val |= GEN_HDATA(tx_buf[0]); + if (msg->tx_len > 1) + val |= GEN_HDATA(tx_buf[1] << 8); if (msg->tx_len > 2) { dev_err(dsi->dev, "too long tx buf length %zu for short write\n",