linux-kernel - [PATCH 3/5] staging: kpc2000: kpc_i2c: prevent memory leak in probe() error case

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Date:   Sat, 18 May 2019 02:29:58 +0000
From:   Geordan Neukum <gneukum1@...il.com>
To:     gneukum1@...il.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] staging: kpc2000: kpc_i2c: prevent memory leak in probe() error case

The probe() function performs a kzalloc to dynamically allocate memory
at runtime. If the allocation succeeds, yet invoking the function
i2c_add_adapter fails, the dynamically allocated memory is never freed.
Change the allocation to use the managed allocation API instead and
remove the manual freeing of the memory in the remove() function.

Signed-off-by: Geordan Neukum <gneukum1@...il.com>
---
 drivers/staging/kpc2000/kpc_i2c/i2c_driver.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/staging/kpc2000/kpc_i2c/i2c_driver.c b/drivers/staging/kpc2000/kpc_i2c/i2c_driver.c
index 6cb63d20b00f..9b9de81c8548 100644
--- a/drivers/staging/kpc2000/kpc_i2c/i2c_driver.c
+++ b/drivers/staging/kpc2000/kpc_i2c/i2c_driver.c
@@ -628,7 +628,7 @@ int pi2c_probe(struct platform_device *pldev)
 
 	dev_dbg(&pldev->dev, "pi2c_probe(pldev = %p '%s')\n", pldev, pldev->name);
 
-	priv = kzalloc(sizeof(struct i2c_device), GFP_KERNEL);
+	priv = devm_kzalloc(&pldev->dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv) {
 		return -ENOMEM;
 	}
@@ -685,10 +685,6 @@ int pi2c_remove(struct platform_device *pldev)
 	//pci_set_drvdata(dev, NULL);
 
 	//cdev_del(&lddev->cdev);
-	if(lddev != 0) {
-		kfree(lddev);
-		pldev->dev.platform_data = 0;
-	}
 
 	return 0;
 }
-- 
2.21.0