linux-kernel - [PATCH] i2c: iop3xx: Fix memory leak in probe error path

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Date:   Mon, 13 Jan 2020 18:29:54 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Krzysztof Kozlowski <krzk@...nel.org>
Subject: [PATCH] i2c: iop3xx: Fix memory leak in probe error path

When handling devm_gpiod_get_optional() errors, free the memory already
allocated.  This fixes Smatch warnings:

    drivers/i2c/busses/i2c-iop3xx.c:437 iop3xx_i2c_probe() warn: possible memory leak of 'new_adapter'
    drivers/i2c/busses/i2c-iop3xx.c:442 iop3xx_i2c_probe() warn: possible memory leak of 'new_adapter'

Reported-by: kbuild test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
---
 drivers/i2c/busses/i2c-iop3xx.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/i2c/busses/i2c-iop3xx.c b/drivers/i2c/busses/i2c-iop3xx.c
index 38556381f4ca..2f8b8050a223 100644
--- a/drivers/i2c/busses/i2c-iop3xx.c
+++ b/drivers/i2c/busses/i2c-iop3xx.c
@@ -433,13 +433,17 @@ iop3xx_i2c_probe(struct platform_device *pdev)
 	adapter_data->gpio_scl = devm_gpiod_get_optional(&pdev->dev,
 							 "scl",
 							 GPIOD_ASIS);
-	if (IS_ERR(adapter_data->gpio_scl))
-		return PTR_ERR(adapter_data->gpio_scl);
+	if (IS_ERR(adapter_data->gpio_scl)) {
+		ret = PTR_ERR(adapter_data->gpio_scl);
+		goto free_both;
+	}
 	adapter_data->gpio_sda = devm_gpiod_get_optional(&pdev->dev,
 							 "sda",
 							 GPIOD_ASIS);
-	if (IS_ERR(adapter_data->gpio_sda))
-		return PTR_ERR(adapter_data->gpio_sda);
+	if (IS_ERR(adapter_data->gpio_sda)) {
+		ret = PTR_ERR(adapter_data->gpio_sda);
+		goto free_both;
+	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
-- 
2.17.1