linux-kernel - [PATCH] drm/bridge: it6505: Fix potential NULL dereference

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Message-ID: <5e6e8882-478a-46c0-9119-b643d524cc0c@moroto.mountain>
Date: Sat, 8 Jun 2024 17:21:08 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Allen Chen <allen.chen@....com.tw>
Cc: Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	Hermes Wu <hermes.wu@....com.tw>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] drm/bridge: it6505: Fix potential NULL dereference

Smatch complains correctly that the NULL checking isn't consistent:

    drivers/gpu/drm/bridge/ite-it6505.c:2583 it6505_poweron()
    error: we previously assumed 'pdata->pwr18' could be null
    (see line 2569)

Add a NULL check to prevent a NULL dereference on the error path.

Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/gpu/drm/bridge/ite-it6505.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index 3f68c82888c2..4f01fadaec0f 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -2580,7 +2580,8 @@ static int it6505_poweron(struct it6505 *it6505)
 		usleep_range(1000, 2000);
 		err = regulator_enable(pdata->ovdd);
 		if (err) {
-			regulator_disable(pdata->pwr18);
+			if (pdata->pwr18)
+				regulator_disable(pdata->pwr18);
 			return err;
 		}
 	}
-- 
2.43.0