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=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 A926FC43465 for ; Fri, 18 Sep 2020 02:28:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6A343235F7 for ; Fri, 18 Sep 2020 02:28:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600396125; bh=coEGVUznuFfa6GSztzmYsJ5ao0RL88SvQOSVc9PE6jw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=f3gNYZsqA2r2GhJk6ZhRlZomqjXPBLAPWzEcnVoLWalb4SUf7QF8z1ghbuRnKmQLY Sas80runbpZPrfAbjNcogSJTdcb7N9rkNzAkAhUmoXROVLk3MV+y9KVNCRBpLF89xq z8icqPEwQRqADSobJoWWsn+qRZHwxbUh2B8C1zOo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729746AbgIRC2o (ORCPT ); Thu, 17 Sep 2020 22:28:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:44122 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729217AbgIRCPW (ORCPT ); Thu, 17 Sep 2020 22:15:22 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 54E0123A01; Fri, 18 Sep 2020 02:15:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600395320; bh=coEGVUznuFfa6GSztzmYsJ5ao0RL88SvQOSVc9PE6jw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sP5OeykcZMgzmAkGfRW+r8KdcB0Jf3eXfpof2axxETUmc2oi4gPtPLJJWHCxEaVx9 9Ts3Gz/hrjMIj2misBxlUVuvKdcs1MpsD7O2fFhgVe/sZk7tWlxDbBa3AqbT27RAD/ 64KlS+fAiw2L35rdUCim1bMP55Ed6eyBIS4ZLBB0= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Nikhil Devshatwar , Benoit Parrot , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin , linux-media@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 21/90] media: ti-vpe: cal: Restrict DMA to avoid memory corruption Date: Thu, 17 Sep 2020 22:13:46 -0400 Message-Id: <20200918021455.2067301-21-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200918021455.2067301-1-sashal@kernel.org> References: <20200918021455.2067301-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nikhil Devshatwar [ Upstream commit 6e72eab2e7b7a157d554b8f9faed7676047be7c1 ] When setting DMA for video capture from CSI channel, if the DMA size is not given, it ends up writing as much data as sent by the camera. This may lead to overwriting the buffers causing memory corruption. Observed green lines on the default framebuffer. Restrict the DMA to maximum height as specified in the S_FMT ioctl. Signed-off-by: Nikhil Devshatwar Signed-off-by: Benoit Parrot Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/platform/ti-vpe/cal.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/media/platform/ti-vpe/cal.c b/drivers/media/platform/ti-vpe/cal.c index 563b9636ab63b..803e0794ca131 100644 --- a/drivers/media/platform/ti-vpe/cal.c +++ b/drivers/media/platform/ti-vpe/cal.c @@ -690,12 +690,13 @@ static void pix_proc_config(struct cal_ctx *ctx) } static void cal_wr_dma_config(struct cal_ctx *ctx, - unsigned int width) + unsigned int width, unsigned int height) { u32 val; val = reg_read(ctx->dev, CAL_WR_DMA_CTRL(ctx->csi2_port)); set_field(&val, ctx->csi2_port, CAL_WR_DMA_CTRL_CPORT_MASK); + set_field(&val, height, CAL_WR_DMA_CTRL_YSIZE_MASK); set_field(&val, CAL_WR_DMA_CTRL_DTAG_PIX_DAT, CAL_WR_DMA_CTRL_DTAG_MASK); set_field(&val, CAL_WR_DMA_CTRL_MODE_CONST, @@ -1321,7 +1322,8 @@ static int cal_start_streaming(struct vb2_queue *vq, unsigned int count) csi2_lane_config(ctx); csi2_ctx_config(ctx); pix_proc_config(ctx); - cal_wr_dma_config(ctx, ctx->v_fmt.fmt.pix.bytesperline); + cal_wr_dma_config(ctx, ctx->v_fmt.fmt.pix.bytesperline, + ctx->v_fmt.fmt.pix.height); cal_wr_dma_addr(ctx, addr); csi2_ppi_enable(ctx); -- 2.25.1