linux-kernel - [PATCH 3.4 100/176] gpio: fix memory and reference leaks in gpiochip

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Date:	Thu,  9 Apr 2015 16:45:48 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 100/176] gpio: fix memory and reference leaks in gpiochip_add error path

From: Johan Hovold <johan@...nel.org>

3.4.107-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 5539b3c938d64a60cb1fc442ac3ce9263d52de0c upstream.

Memory allocated and references taken by of_gpiochip_add and
acpi_gpiochip_add were never released on errors in gpiochip_add (e.g.
failure to find free gpio range).

Fixes: 391c970c0dd1 ("of/gpio: add default of_xlate function if device
has a node pointer")
Fixes: 664e3e5ac64c ("gpio / ACPI: register to ACPI events
automatically")

Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
[lizf: Backported to 3.4:
 - move the call to of_gpiochip_add() into the above if condition.
 - remove the call to acpi_gpiochip_remove()]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/gpio/gpiolib.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 112c16e..663570c 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1081,19 +1081,18 @@ int gpiochip_add(struct gpio_chip *chip)
 				? (1 << FLAG_IS_OUT)
 				: 0;
 		}
-	}
 
-	of_gpiochip_add(chip);
+		of_gpiochip_add(chip);
+	}
 
 unlock:
 	spin_unlock_irqrestore(&gpio_lock, flags);
 
-	if (status)
-		goto fail;
-
 	status = gpiochip_export(chip);
-	if (status)
+	if (status) {
+		of_gpiochip_remove(chip);
 		goto fail;
+	}
 
 	pr_info("gpiochip_add: registered GPIOs %d to %d on device: %s\n",
 		chip->base, chip->base + chip->ngpio - 1,
-- 
1.9.1

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