linux-kernel - [PATCH 1/2] drm/panel/raspberrypi-touchscreen: Avoid NULL deref if not initialised

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Message-Id: <20220415162513.42190-2-stefan.wahren@i2se.com>
Date:   Fri, 15 Apr 2022 18:25:12 +0200
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Maxime Ripard <maxime@...no.tech>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Stefan Wahren <stefan.wahren@...e.com>
Subject: [PATCH 1/2] drm/panel/raspberrypi-touchscreen: Avoid NULL deref if not initialised

From: Dave Stevenson <dave.stevenson@...pberrypi.com>

If a call to rpi_touchscreen_i2c_write from rpi_touchscreen_probe
fails before mipi_dsi_device_register_full is called, then
in trying to log the error message if uses ts->dsi->dev when
it is still NULL.

Use ts->i2c->dev instead, which is initialised earlier in probe.

Fixes: 2f733d6194bd ("drm/panel: Add support for the Raspberry Pi 7" Touchscreen.")
Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
---
 drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
index 46029c5610c8..1f805eb8fdb5 100644
--- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
+++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
@@ -229,7 +229,7 @@ static void rpi_touchscreen_i2c_write(struct rpi_touchscreen *ts,
 
 	ret = i2c_smbus_write_byte_data(ts->i2c, reg, val);
 	if (ret)
-		dev_err(&ts->dsi->dev, "I2C write failed: %d\n", ret);
+		dev_err(&ts->i2c->dev, "I2C write failed: %d\n", ret);
 }
 
 static int rpi_touchscreen_write(struct rpi_touchscreen *ts, u16 reg, u32 val)
-- 
2.25.1