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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Cc: Daniel Thompson <daniel.thompson@linaro.org>,
	Lee Jones <lee@kernel.org>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH 6.8 527/715] backlight: lm3639: Fully initialize backlight_properties during probe
Date: Sun, 24 Mar 2024 18:31:46 -0400
Message-ID: <20240324223455.1342824-528-sashal@kernel.org>
In-Reply-To: <20240324223455.1342824-1-sashal@kernel.org>
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From: Daniel Thompson <daniel.thompson@linaro.org>

[ Upstream commit abb5a5d951fbea3feb5c4ba179b89bb96a1d3462 ]

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: 0f59858d5119 ("backlight: add new lm3639 backlight driver")
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20240220153532.76613-3-daniel.thompson@linaro.org
Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/video/backlight/lm3639_bl.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/video/backlight/lm3639_bl.c b/drivers/video/backlight/lm3639_bl.c
index 5246c171497d6..564f62acd7211 100644
--- a/drivers/video/backlight/lm3639_bl.c
+++ b/drivers/video/backlight/lm3639_bl.c
@@ -338,6 +338,7 @@ static int lm3639_probe(struct i2c_client *client)
 	}
 
 	/* backlight */
+	memset(&props, 0, sizeof(struct backlight_properties));
 	props.type = BACKLIGHT_RAW;
 	props.brightness = pdata->init_brt_led;
 	props.max_brightness = pdata->max_brt_led;
-- 
2.43.0