linux-kernel - [PATCH 5.8 62/85] gpio: pca953x: Fix uninitialized pending variable

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Date:   Mon,  5 Oct 2020 17:26:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ye Li <ye.li@....com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.8 62/85] gpio: pca953x: Fix uninitialized pending variable

From: Ye Li <ye.li@....com>

[ Upstream commit e43c26e12dd49a41cf5a4cd5c5b59a1eb98ed11e ]

When pca953x_irq_pending returns false, the pending parameter won't
be set. But pca953x_irq_handler continues using this uninitialized
variable as pending irqs and will cause problem.
Fix the issue by initializing pending to 0.

Fixes: 064c73afe738 ("gpio: pca953x: Synchronize interrupt handler properly")
Signed-off-by: Ye Li <ye.li@....com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpio/gpio-pca953x.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index a3b9bdedbe443..cc95f1630feb0 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -813,7 +813,7 @@ static irqreturn_t pca953x_irq_handler(int irq, void *devid)
 {
 	struct pca953x_chip *chip = devid;
 	struct gpio_chip *gc = &chip->gpio_chip;
-	DECLARE_BITMAP(pending, MAX_LINE);
+	DECLARE_BITMAP(pending, MAX_LINE) = {};
 	int level;
 	bool ret;
 
-- 
2.25.1