linux-kernel - [PATCH v2] spi: gpio: prevent memory leak in spi_gpio

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Message-Id: <20190930205241.5483-1-navid.emamdoost@gmail.com>
Date:   Mon, 30 Sep 2019 15:52:40 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     emamd001@....edu, smccaman@....edu, kjlu@....edu,
        Navid Emamdoost <navid.emamdoost@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] spi: gpio: prevent memory leak in spi_gpio_probe

In spi_gpio_probe an SPI master is allocated via spi_alloc_master, but
this controller should be released if devm_add_action_or_reset fails,
otherwise memory leaks. In order to avoid leak spi_contriller_put must
be called in case of failure for devm_add_action_or_reset.

Fixes: 8b797490b4db ("spi: gpio: Make sure spi_master_put() is called in every error path")
Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
Changes in v2:
	-- fix a typo in title and update the description
---
 drivers/spi/spi-gpio.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-gpio.c b/drivers/spi/spi-gpio.c
index 1d3e23ec20a6..f9c5bbb74714 100644
--- a/drivers/spi/spi-gpio.c
+++ b/drivers/spi/spi-gpio.c
@@ -371,8 +371,10 @@ static int spi_gpio_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	status = devm_add_action_or_reset(&pdev->dev, spi_gpio_put, master);
-	if (status)
+	if (status) {
+		spi_master_put(master);
 		return status;
+	}
 
 	if (of_id)
 		status = spi_gpio_probe_dt(pdev, master);
-- 
2.17.1