From patchwork Fri Oct 18 05:53:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 13841144 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2543E17C9F1; Fri, 18 Oct 2024 05:53:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729230807; cv=none; b=KzVajnWqqwqmR0jrMK9mXzqsYxoPmz2GCp/bC5bIABLYKT0LgteIs/iJke7lU2xj8ngGDTXLy/2d7fiiiQGalf38d4kdT2ns+Zk8mbVBvlmuO9y4EUxyeB75xSLFdEsDs4DY/HEroQWoArmJV3LOzoffS8cE3/Byo1qbDbd2vQ4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729230807; c=relaxed/simple; bh=EslwWem0URL7HGO0wGR9dgXiEgLFlOjHPztcB3xbGHw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eP2eRr22ebD0jQfkFVcIZLeBC+GCL0g8SmU+6Lf8XSOG6yrnnvCSXJtsxFytgdGQrFxJN/mKOymKvFygEVpTGigUPz9J75gxRpNa2Y6EGjiI6M44OicgtNLyFabTVgoVPnW7TeNEzYjnjLHPDeLuYNdsNWqQ0VFbigSqZQ7w9Ng= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=s+4M4QAJ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="s+4M4QAJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B4E05C4CEC5; Fri, 18 Oct 2024 05:53:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729230806; bh=EslwWem0URL7HGO0wGR9dgXiEgLFlOjHPztcB3xbGHw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=s+4M4QAJ9NeQhp+U1BtM50Ej1Wpn9EQIGRoEmMNJ0LQmzUuBi2xb0Yzfm7yl1pbNN KpobAQpYDa/+z4rvECsuKGZwJNUnmZfxXUCsCcdnSI8m51E8t5kZh0au7EBAwROKZq HD2zU3YoBV4pOMvjoNjqrfNz8W4tUZ7Up1tjVa04YRtp+f6yQdgoRqR0/zLxf5vjju Y9AGHaqz3eCZ2lKZE1c7qqUWkOxFMiJ/1uRIxQ1O4E2hek79tmD3Z187AZUASG4sPj QbW3lWJxCj/PxbBOD6dpqoHdwSxcVzwk3U0TnNfG7wWq1Vbdc3ivbmEsria2udDBXD JkBzSCIAYN/Dg== Received: from mchehab by mail.kernel.org with local (Exim 4.98) (envelope-from ) id 1t1fvQ-00000005MeX-2Ehh; Fri, 18 Oct 2024 07:53:24 +0200 From: Mauro Carvalho Chehab To: Cc: Mauro Carvalho Chehab , Hans Verkuil , Mauro Carvalho Chehab , linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH v2 10/13] media: adv7604: prevent underflow condition when reporting colorspace Date: Fri, 18 Oct 2024 07:53:12 +0200 Message-ID: X-Mailer: git-send-email 2.47.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Sender: Mauro Carvalho Chehab Currently, adv76xx_log_status() reads some date using io_read() which may return negative values. The current logic doesn't check such errors, causing colorspace to be reported on a wrong way at adv76xx_log_status(), as reported by Coverity. If I/O error happens there, print a different message, instead of reporting bogus messages to userspace. Fixes: 54450f591c99 ("[media] adv7604: driver for the Analog Devices ADV7604 video decoder") Signed-off-by: Mauro Carvalho Chehab Reviewed-by: Hans Verkuil --- drivers/media/i2c/adv7604.c | 26 +++++++++++++++++--------- 1 file changed, 17 insertions(+), 9 deletions(-) diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c index 48230d5109f0..272945a878b3 100644 --- a/drivers/media/i2c/adv7604.c +++ b/drivers/media/i2c/adv7604.c @@ -2519,10 +2519,10 @@ static int adv76xx_log_status(struct v4l2_subdev *sd) const struct adv76xx_chip_info *info = state->info; struct v4l2_dv_timings timings; struct stdi_readback stdi; - u8 reg_io_0x02 = io_read(sd, 0x02); + int ret; + u8 reg_io_0x02; u8 edid_enabled; u8 cable_det; - static const char * const csc_coeff_sel_rb[16] = { "bypassed", "YPbPr601 -> RGB", "reserved", "YPbPr709 -> RGB", "reserved", "RGB -> YPbPr601", "reserved", "RGB -> YPbPr709", @@ -2621,13 +2621,21 @@ static int adv76xx_log_status(struct v4l2_subdev *sd) v4l2_info(sd, "-----Color space-----\n"); v4l2_info(sd, "RGB quantization range ctrl: %s\n", rgb_quantization_range_txt[state->rgb_quantization_range]); - v4l2_info(sd, "Input color space: %s\n", - input_color_space_txt[reg_io_0x02 >> 4]); - v4l2_info(sd, "Output color space: %s %s, alt-gamma %s\n", - (reg_io_0x02 & 0x02) ? "RGB" : "YCbCr", - (((reg_io_0x02 >> 2) & 0x01) ^ (reg_io_0x02 & 0x01)) ? - "(16-235)" : "(0-255)", - (reg_io_0x02 & 0x08) ? "enabled" : "disabled"); + + ret = io_read(sd, 0x02); + if (ret < 0) { + v4l2_info(sd, "Can't read Input/Output color space\n"); + } else { + reg_io_0x02 = ret; + + v4l2_info(sd, "Input color space: %s\n", + input_color_space_txt[reg_io_0x02 >> 4]); + v4l2_info(sd, "Output color space: %s %s, alt-gamma %s\n", + (reg_io_0x02 & 0x02) ? "RGB" : "YCbCr", + (((reg_io_0x02 >> 2) & 0x01) ^ (reg_io_0x02 & 0x01)) ? + "(16-235)" : "(0-255)", + (reg_io_0x02 & 0x08) ? "enabled" : "disabled"); + } v4l2_info(sd, "Color space conversion: %s\n", csc_coeff_sel_rb[cp_read(sd, info->cp_csc) >> 4]);