linux-kernel - [PATCH AUTOSEL for 4.9 26/56] gpio: mockup: dynamically allocate memory for chip name

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Date:   Wed, 15 Nov 2017 02:45:41 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.9 26/56] gpio: mockup: dynamically allocate
 memory for chip name

From: Bartosz Golaszewski <bgolaszewski@...libre.com>

[ Upstream commit ad6d8004fa29a8958381b60215e32d1e903b0492 ]

Currently the chip name buffer is allocated on the stack and the
address of the buffer is passed to the gpio framework. It's invalid
after probe() returns, so the sysfs label attribute displays garbage.

Use devm_kasprintf() for each string instead.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/gpio/gpio-mockup.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index 1ef85b0c2b1f..d27e9361e236 100644
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -126,7 +126,7 @@ static int mockup_gpio_probe(struct platform_device *pdev)
 	int i;
 	int base;
 	int ngpio;
-	char chip_name[sizeof(GPIO_NAME) + 3];
+	char *chip_name;
 
 	if (gpio_mockup_params_nr < 2)
 		return -EINVAL;
@@ -146,8 +146,12 @@ static int mockup_gpio_probe(struct platform_device *pdev)
 			ngpio = gpio_mockup_ranges[i * 2 + 1] - base;
 
 		if (ngpio >= 0) {
-			sprintf(chip_name, "%s-%c", GPIO_NAME,
-				pins_name_start + i);
+			chip_name = devm_kasprintf(dev, GFP_KERNEL,
+						   "%s-%c", GPIO_NAME,
+						   pins_name_start + i);
+			if (!chip_name)
+				return -ENOMEM;
+
 			ret = mockup_gpio_add(dev, &cntr[i],
 					      chip_name, base, ngpio);
 		} else {
-- 
2.11.0