linux-kernel - [PATCH V4 5/5] gpio: gpio-xilinx: Add check if width exceeds 32

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Date:   Wed, 6 Jan 2021 17:56:40 +0530
From:   Srinivas Neeli <srinivas.neeli@...inx.com>
To:     <linus.walleij@...aro.org>, <bgolaszewski@...libre.com>,
        <michal.simek@...inx.com>, <shubhrajyoti.datta@...inx.com>,
        <sgoud@...inx.com>, <hancock@...systems.ca>,
        <vilhelm.gray@...il.com>, <syednwaris@...il.com>
CC:     <linux-gpio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <git@...inx.com>,
        Srinivas Neeli <srinivas.neeli@...inx.com>
Subject: [PATCH V4 5/5] gpio: gpio-xilinx: Add check if width exceeds 32

Add check to see if gpio-width property does not exceed 32.
If it exceeds then return -EINVAL.

Signed-off-by: Srinivas Neeli <srinivas.neeli@...inx.com>
---
Changes in V4:
-New patch.
---
 drivers/gpio/gpio-xilinx.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
index e47ae08167f8..ddec718e114c 100644
--- a/drivers/gpio/gpio-xilinx.c
+++ b/drivers/gpio/gpio-xilinx.c
@@ -591,6 +591,9 @@ static int xgpio_probe(struct platform_device *pdev)
 	if (of_property_read_u32(np, "xlnx,gpio-width", &chip->gpio_width[0]))
 		chip->gpio_width[0] = 32;
 
+	if (chip->gpio_width[0] > 32)
+		return -EINVAL;
+
 	spin_lock_init(&chip->gpio_lock);
 
 	if (of_property_read_u32(np, "xlnx,is-dual", &is_dual))
@@ -615,6 +618,8 @@ static int xgpio_probe(struct platform_device *pdev)
 					 &chip->gpio_width[1]))
 			chip->gpio_width[1] = 32;
 
+		if (chip->gpio_width[1] > 32)
+			return -EINVAL;
 	}
 
 	chip->gc.base = -1;
-- 
2.7.4