linux-kernel - [PATCH 4.19 123/148] backlight: da9052: Fully initialize backlight

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Date: Sun, 24 Mar 2024 19:49:47 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Daniel Thompson <daniel.thompson@...aro.org>,
	Lee Jones <lee@...nel.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 123/148] backlight: da9052: Fully initialize backlight_properties during probe

From: Daniel Thompson <daniel.thompson@...aro.org>

[ Upstream commit 0285e9efaee8276305db5c52a59baf84e9731556 ]

props is stack allocated and the fields that are not explcitly set
by the probe function need to be zeroed or we'll get undefined behaviour
(especially so power/blank states)!

Fixes: 6ede3d832aaa ("backlight: add driver for DA9052/53 PMIC v1")
Signed-off-by: Daniel Thompson <daniel.thompson@...aro.org>
Link: https://lore.kernel.org/r/20240220153532.76613-2-daniel.thompson@linaro.org
Signed-off-by: Lee Jones <lee@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/video/backlight/da9052_bl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/video/backlight/da9052_bl.c b/drivers/video/backlight/da9052_bl.c
index 49035c12739a1..d48513eb3bc5f 100644
--- a/drivers/video/backlight/da9052_bl.c
+++ b/drivers/video/backlight/da9052_bl.c
@@ -122,6 +122,7 @@ static int da9052_backlight_probe(struct platform_device *pdev)
 	wleds->led_reg = platform_get_device_id(pdev)->driver_data;
 	wleds->state = DA9052_WLEDS_OFF;
 
+	memset(&props, 0, sizeof(struct backlight_properties));
 	props.type = BACKLIGHT_RAW;
 	props.max_brightness = DA9052_MAX_BRIGHTNESS;
 
-- 
2.43.0