linux-kernel - [PATCH v15 2/4] drm/msm/dp: populate connector of struct dp

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1642194710-2512-3-git-send-email-quic_khsieh@quicinc.com>
Date:   Fri, 14 Jan 2022 13:11:48 -0800
From:   Kuogee Hsieh <quic_khsieh@...cinc.com>
To:     <dri-devel@...ts.freedesktop.org>, <robdclark@...il.com>,
        <sean@...rly.run>, <swboyd@...omium.org>, <vkoul@...nel.org>,
        <daniel@...ll.ch>, <airlied@...ux.ie>, <agross@...nel.org>,
        <dmitry.baryshkov@...aro.org>, <bjorn.andersson@...aro.org>
CC:     Kuogee Hsieh <quic_khsieh@...cinc.com>,
        <quic_abhinavk@...cinc.com>, <aravindh@...eaurora.org>,
        <quic_sbillaka@...cinc.com>, <freedreno@...ts.freedesktop.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v15 2/4] drm/msm/dp:  populate connector of struct  dp_panel

DP CTS test case 4.2.2.6 has valid edid with bad checksum on purpose
and expect DP source return correct checksum. During drm edid read,
correct edid checksum is calculated and stored at
connector::real_edid_checksum.

The problem is struct dp_panel::connector never be assigned, instead the
connector is stored in struct msm_dp::connector. When we run compliance
testing test case 4.2.2.6 dp_panel_handle_sink_request() won't have a valid
edid set in struct dp_panel::edid so we'll try to use the connectors
real_edid_checksum and hit a NULL pointer dereference error because the
connector pointer is never assigned.

Changes in V2:
-- populate panel connector at msm_dp_modeset_init() instead of at dp_panel_read_sink_caps()

Changes in V3:
-- remove unhelpful kernel crash trace commit text
-- remove renaming dp_display parameter to dp

Changes in V4:
-- add more details to commit text

Changes in v10:
--  group into one series

Changes in v11:
-- drop drm/msm/dp: dp_link_parse_sink_count() return immediately if aux read

Fixes: 7948fe12d47 ("drm/msm/dp: return correct edid checksum after corrupted edid checksum read")
Signee-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Reviewed-by: Stephen Boyd <swboyd@...omium.org>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 7cd6222..2dbbbe84 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1472,6 +1472,7 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
 			struct drm_encoder *encoder)
 {
 	struct msm_drm_private *priv;
+	struct dp_display_private *dp_priv;
 	int ret;
 
 	if (WARN_ON(!encoder) || WARN_ON(!dp_display) || WARN_ON(!dev))
@@ -1480,6 +1481,8 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
 	priv = dev->dev_private;
 	dp_display->drm_dev = dev;
 
+	dp_priv = container_of(dp_display, struct dp_display_private, dp_display);
+
 	ret = dp_display_request_irq(dp_display);
 	if (ret) {
 		DRM_ERROR("request_irq failed, ret=%d\n", ret);
@@ -1497,6 +1500,8 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
 		return ret;
 	}
 
+	dp_priv->panel->connector = dp_display->connector;
+
 	priv->connectors[priv->num_connectors++] = dp_display->connector;
 
 	dp_display->bridge = msm_dp_bridge_init(dp_display, dev, encoder);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project