From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 7AEB4427F8D for ; Mon, 3 Aug 2026 19:11:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785784286; cv=none; b=Pw31sXkldECcY75HMqalzJo4FsTi2o7/9XrpStH1W+yWq2vpsMnthORJBMOm7UBE78EH/U1ZZhM9WoA03Gpn/A0kQQ5a4f9EiRbw/js2v0HcfbtrxfRzwBXZe+5JmZKPU+dSeEk4F1r9Xyp/H8rpBlCLC004dBQ7AnlKgmQxevo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785784286; c=relaxed/simple; bh=pbyVuL0jyIOpRjobRLpTrVDGSBb2tXH8rM+mBeDjXq0=; h=From:Subject:To:Cc:In-Reply-To:References:Content-Type:Date: Message-Id; b=UQtAML4lKB/COFFdcvez/U1XFNTI8nkumkae3MlTydVdBNv18Rvhhny+osriXO7cWozjiqO2dQMgFlVDFxgZysfFXsEEVW7bZicvjxTPyw91FsCP8/6H8aTq//GxX90dPmXtShsqPJ3kjFxKv1xmQC/PoYIVh5arNybSUUZoCyk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=V42jbEtP; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="V42jbEtP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DB6881F000E9; Mon, 3 Aug 2026 19:11:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785784285; bh=CEkB3xaDs0YfnDvaLlwCGFAPS42mAHu8+bIMDJw6FWU=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=V42jbEtPHEasv/YwWqUtEjJVvPNxlVam/kdBKspeE4qeAcR1hhRX6R/z6TW+68hNJ gjc4o9QjhAsBcyWnXaruuJgm8M+9+TOceRJYmxqpxK59nbjt1FJvp+uyMbKPNvB/T0 1SrQF7JjkU6I5eh1gaoHpgLQ1dNPFQ081ZLd30rku2pOSTi11KG11vzpgnW346rpdM 8FIrRlJQa0InjOCbz9LwL1rFnTuR/+vwoWleIaOoSMPVdOzI9uEPeMeeKKdbzcajaL 7DOMIKODr1tOXahWrZNuL63DMYpqTtqAbWaQqRud05iZIsj8yzj5621ZZ24nh1zy+f e88NnxMfWCwvw== From: sashiko-bot@kernel.org Subject: Re: [PATCH v9 22/22] drm/bridge: synopsys: dw-dp: Add audio support Reply-To: sashiko-reviews@lists.linux.dev To: "Sebastian Reichel" Cc: conor+dt@kernel.org, devicetree@vger.kernel.org, robh@kernel.org, dri-devel@lists.freedesktop.org In-Reply-To: <20260803-synopsys-dw-dp-improvements-v9-22-2e6e46135312@collabora.com> References: <20260803-synopsys-dw-dp-improvements-v9-0-2e6e46135312@collabora.com> <20260803-synopsys-dw-dp-improvements-v9-22-2e6e46135312@collabora.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Mon, 03 Aug 2026 19:11:24 +0000 Message-Id: <20260803191124.DB6881F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Thank you for your contribution! Sashiko AI review found 1 potential issue(= s) to consider: - [Medium] The result of regmap_read() is used without checking its return = value, potentially leading to the use of uninitialized stack memory. -- --- Patch [22]: [PATCH v9 22/22] drm/bridge: synopsys: dw-dp: Add audio sup= port --- commit f36ed9436eafc188ce4405c443eb47147a26dbd1 Author: Sebastian Reichel drm/bridge: synopsys: dw-dp: Add audio support This commit implements audio support for the Synopsys DesignWare DisplayPort controller. > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-dp.c b/drivers/gpu/drm/br= idge/synopsys/dw-dp.c > --- a/drivers/gpu/drm/bridge/synopsys/dw-dp.c > +++ b/drivers/gpu/drm/bridge/synopsys/dw-dp.c [ ... ] > @@ -1690,6 +1721,254 @@ static int dw_dp_link_enable(struct dw_dp *dp) [ ... ] > +static int dw_dp_audio_prepare(struct drm_bridge *bridge, > + struct drm_connector *connector, > + struct hdmi_codec_daifmt *daifmt, > + struct hdmi_codec_params *params) > +{ > + struct dw_dp *dp =3D bridge_to_dp(bridge); > + u8 supported_audio_interfaces; > + enum dw_dp_audio_interface audio_interface; > + u32 cfg1; > + int ret; [ ... ] > + switch (daifmt->fmt) { > + case HDMI_SPDIF: > + audio_interface =3D DW_DP_AUDIO_SPDIF; > + break; > + case HDMI_I2S: > + /* > + * It is recommended to use SPDIF instead of I2S, since I2S mode requi= res > + * manually inserting PCUV control bits from userspace and this is done > + * automatically in hardware for SPDIF mode. > + */ > + audio_interface =3D DW_DP_AUDIO_I2S; > + break; > + default: > + dev_err(dp->dev, "invalid DAI format %d\n", daifmt->fmt); > + return -EINVAL; > + } > + > + regmap_read(dp->regmap, DW_DP_CONFIG_REG1, &cfg1); > + supported_audio_interfaces =3D FIELD_GET(AUDIO_SELECT, cfg1); [Severity: Medium] Is it possible for regmap_read() to fail here? If the read operation fails, cfg1 would remain uninitialized, causing FIELD_GET() to operate on uninitialized stack memory.=20 Should the return value of regmap_read() be checked before accessing cfg1? > + > + if (supported_audio_interfaces !=3D DW_DP_AUDIO_I2S_AND_SPDIF && > + supported_audio_interfaces !=3D audio_interface) { > + dev_err(dp->dev, "unsupported DAI %d\n", daifmt->fmt); > + return -EINVAL; > + } [ ... ] --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20260803-synopsys-d= w-dp-improvements-v9-0-2e6e46135312@collabora.com?part=3D22