linux-kernel - [PATCH 4.14 038/242] gpio: mvebu: fix potential user-after-free on probe

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Date:   Mon, 28 Dec 2020 13:47:23 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Baruch Siach <baruch@...s.co.il>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 038/242] gpio: mvebu: fix potential user-after-free on probe

From: Baruch Siach <baruch@...s.co.il>

[ Upstream commit 7ee1a01e47403f72b9f38839a737692f6991263e ]

When mvebu_pwm_probe() fails IRQ domain is not released. Move pwm probe
before IRQ domain allocation. Add pwm cleanup code to the failure path.

Fixes: 757642f9a584 ("gpio: mvebu: Add limited PWM support")
Reported-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Baruch Siach <baruch@...s.co.il>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpio/gpio-mvebu.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c
index be85d4b39e997..fc762b4adcb22 100644
--- a/drivers/gpio/gpio-mvebu.c
+++ b/drivers/gpio/gpio-mvebu.c
@@ -1195,6 +1195,13 @@ static int mvebu_gpio_probe(struct platform_device *pdev)
 
 	devm_gpiochip_add_data(&pdev->dev, &mvchip->chip, mvchip);
 
+	/* Some MVEBU SoCs have simple PWM support for GPIO lines */
+	if (IS_ENABLED(CONFIG_PWM)) {
+		err = mvebu_pwm_probe(pdev, mvchip, id);
+		if (err)
+			return err;
+	}
+
 	/* Some gpio controllers do not provide irq support */
 	if (!have_irqs)
 		return 0;
@@ -1204,7 +1211,8 @@ static int mvebu_gpio_probe(struct platform_device *pdev)
 	if (!mvchip->domain) {
 		dev_err(&pdev->dev, "couldn't allocate irq domain %s (DT).\n",
 			mvchip->chip.label);
-		return -ENODEV;
+		err = -ENODEV;
+		goto err_pwm;
 	}
 
 	err = irq_alloc_domain_generic_chips(
@@ -1252,14 +1260,12 @@ static int mvebu_gpio_probe(struct platform_device *pdev)
 						 mvchip);
 	}
 
-	/* Some MVEBU SoCs have simple PWM support for GPIO lines */
-	if (IS_ENABLED(CONFIG_PWM))
-		return mvebu_pwm_probe(pdev, mvchip, id);
-
 	return 0;
 
 err_domain:
 	irq_domain_remove(mvchip->domain);
+err_pwm:
+	pwmchip_remove(&mvchip->mvpwm->chip);
 
 	return err;
 }
-- 
2.27.0