linux-kernel - [PATCH 4/4] gpio: xilinx: Add extra check to see if sum of widths exceed 64

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Date:   Fri, 20 Nov 2020 23:18:05 +0530
From:   Syed Nayyar Waris <syednwaris@...il.com>
To:     akpm@...ux-foundation.org
Cc:     andriy.shevchenko@...ux.intel.com, vilhelm.gray@...il.com,
        bgolaszewski@...libre.com, michal.simek@...inx.com,
        linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] gpio: xilinx: Add extra check to see if sum of widths
 exceed 64

Add extra check to see if sum of widths does not exceed 64. If it
exceeds then return -EINVAL alongwith appropriate error message.

Cc: Michal Simek <michal.simek@...inx.com>
Signed-off-by: Syed Nayyar Waris <syednwaris@...il.com>
---
 drivers/gpio/gpio-xilinx.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpio/gpio-xilinx.c b/drivers/gpio/gpio-xilinx.c
index 05dae086c4d0..a2e92a1cf50b 100644
--- a/drivers/gpio/gpio-xilinx.c
+++ b/drivers/gpio/gpio-xilinx.c
@@ -340,6 +340,12 @@ static int xgpio_probe(struct platform_device *pdev)
 
 	chip->gc.base = -1;
 	chip->gc.ngpio = chip->gpio_width[0] + chip->gpio_width[1];
+
+	if (chip->gc.ngpio > 64) {
+		dev_err(&pdev->dev, "invalid configuration: number of GPIO is greater than 64");
+		return -EINVAL;
+	}
+
 	chip->gc.parent = &pdev->dev;
 	chip->gc.direction_input = xgpio_dir_in;
 	chip->gc.direction_output = xgpio_dir_out;
-- 
2.29.0