linux-kernel - [PATCH AUTOSEL 6.3 10/30] platform/x86: int3472: Avoid crash in unregistering regulator gpio

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Message-Id: <20230616102521.673087-10-sashal@kernel.org>
Date:   Fri, 16 Jun 2023 06:24:58 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hao Yao <hao.yao@...el.com>, Bingbu Cao <bingbu.cao@...el.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Sasha Levin <sashal@...nel.org>, djrscally@...il.com,
        markgross@...nel.org, platform-driver-x86@...r.kernel.org
Subject: [PATCH AUTOSEL 6.3 10/30] platform/x86: int3472: Avoid crash in unregistering regulator gpio

From: Hao Yao <hao.yao@...el.com>

[ Upstream commit fb109fba728407fa4a84d659b5cb87cd8399d7b3 ]

When int3472 is loaded before GPIO driver, acpi_get_and_request_gpiod()
failed but the returned gpio descriptor is not NULL, it will cause panic
in later gpiod_put(), so set the gpio_desc to NULL in register error
handling to avoid such crash.

Signed-off-by: Hao Yao <hao.yao@...el.com>
Signed-off-by: Bingbu Cao <bingbu.cao@...el.com>
Link: https://lore.kernel.org/r/20230524035135.90315-1-bingbu.cao@intel.com
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 .../platform/x86/intel/int3472/clk_and_regulator.c  | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/intel/int3472/clk_and_regulator.c b/drivers/platform/x86/intel/int3472/clk_and_regulator.c
index 1086c3d834945..399f0623ca1b5 100644
--- a/drivers/platform/x86/intel/int3472/clk_and_regulator.c
+++ b/drivers/platform/x86/intel/int3472/clk_and_regulator.c
@@ -101,9 +101,11 @@ int skl_int3472_register_clock(struct int3472_discrete_device *int3472,
 
 	int3472->clock.ena_gpio = acpi_get_and_request_gpiod(path, agpio->pin_table[0],
 							     "int3472,clk-enable");
-	if (IS_ERR(int3472->clock.ena_gpio))
-		return dev_err_probe(int3472->dev, PTR_ERR(int3472->clock.ena_gpio),
-				     "getting clk-enable GPIO\n");
+	if (IS_ERR(int3472->clock.ena_gpio)) {
+		ret = PTR_ERR(int3472->clock.ena_gpio);
+		int3472->clock.ena_gpio = NULL;
+		return dev_err_probe(int3472->dev, ret, "getting clk-enable GPIO\n");
+	}
 
 	if (polarity == GPIO_ACTIVE_LOW)
 		gpiod_toggle_active_low(int3472->clock.ena_gpio);
@@ -199,8 +201,9 @@ int skl_int3472_register_regulator(struct int3472_discrete_device *int3472,
 	int3472->regulator.gpio = acpi_get_and_request_gpiod(path, agpio->pin_table[0],
 							     "int3472,regulator");
 	if (IS_ERR(int3472->regulator.gpio)) {
-		dev_err(int3472->dev, "Failed to get regulator GPIO line\n");
-		return PTR_ERR(int3472->regulator.gpio);
+		ret = PTR_ERR(int3472->regulator.gpio);
+		int3472->regulator.gpio = NULL;
+		return dev_err_probe(int3472->dev, ret, "getting regulator GPIO\n");
 	}
 
 	/* Ensure the pin is in output mode and non-active state */
-- 
2.39.2