linux-kernel - [PATCH AUTOSEL 5.15 14/20] drm/panel/panel-tpo-tpg110: fix a possible null pointer dereference

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Message-ID: <20231107122940.3762228-14-sashal@kernel.org>
Date:   Tue,  7 Nov 2023 07:29:08 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ma Ke <make_ruc2021@....com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Sasha Levin <sashal@...nel.org>, linus.walleij@...aro.org,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.15 14/20] drm/panel/panel-tpo-tpg110: fix a possible null pointer dereference

From: Ma Ke <make_ruc2021@....com>

[ Upstream commit f22def5970c423ea7f87d5247bd0ef91416b0658 ]

In tpg110_get_modes(), the return value of drm_mode_duplicate() is
assigned to mode, which will lead to a NULL pointer dereference on
failure of drm_mode_duplicate(). Add a check to avoid npd.

Signed-off-by: Ma Ke <make_ruc2021@....com>
Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
Link: https://lore.kernel.org/r/20231009090446.4043798-1-make_ruc2021@163.com
Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231009090446.4043798-1-make_ruc2021@163.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/panel/panel-tpo-tpg110.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-tpo-tpg110.c b/drivers/gpu/drm/panel/panel-tpo-tpg110.c
index e3791dad6830c..3360e7ccb0a7d 100644
--- a/drivers/gpu/drm/panel/panel-tpo-tpg110.c
+++ b/drivers/gpu/drm/panel/panel-tpo-tpg110.c
@@ -379,6 +379,8 @@ static int tpg110_get_modes(struct drm_panel *panel,
 	connector->display_info.bus_flags = tpg->panel_mode->bus_flags;
 
 	mode = drm_mode_duplicate(connector->dev, &tpg->panel_mode->mode);
+	if (!mode)
+		return -ENOMEM;
 	drm_mode_set_name(mode);
 	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
 
-- 
2.42.0