linux-kernel - [PATCH 5.16 102/186] auxdisplay: lcd2s: Fix memory leak in ->remove()

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Date:   Mon,  7 Mar 2022 10:19:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lars Poeschel <poeschel@...onage.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Miguel Ojeda <ojeda@...nel.org>
Subject: [PATCH 5.16 102/186] auxdisplay: lcd2s: Fix memory leak in ->remove()

From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

commit 898c0a15425a5bcaa8d44bd436eae5afd2483796 upstream.

Once allocated the struct lcd2s_data is never freed.
Fix the memory leak by switching to devm_kzalloc().

Fixes: 8c9108d014c5 ("auxdisplay: add a driver for lcd2s character display")
Cc: Lars Poeschel <poeschel@...onage.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/auxdisplay/lcd2s.c |   18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

--- a/drivers/auxdisplay/lcd2s.c
+++ b/drivers/auxdisplay/lcd2s.c
@@ -298,6 +298,10 @@ static int lcd2s_i2c_probe(struct i2c_cl
 			I2C_FUNC_SMBUS_WRITE_BLOCK_DATA))
 		return -EIO;
 
+	lcd2s = devm_kzalloc(&i2c->dev, sizeof(*lcd2s), GFP_KERNEL);
+	if (!lcd2s)
+		return -ENOMEM;
+
 	/* Test, if the display is responding */
 	err = lcd2s_i2c_smbus_write_byte(i2c, LCD2S_CMD_DISPLAY_OFF);
 	if (err < 0)
@@ -307,12 +311,6 @@ static int lcd2s_i2c_probe(struct i2c_cl
 	if (!lcd)
 		return -ENOMEM;
 
-	lcd2s = kzalloc(sizeof(struct lcd2s_data), GFP_KERNEL);
-	if (!lcd2s) {
-		err = -ENOMEM;
-		goto fail1;
-	}
-
 	lcd->drvdata = lcd2s;
 	lcd2s->i2c = i2c;
 	lcd2s->charlcd = lcd;
@@ -321,24 +319,22 @@ static int lcd2s_i2c_probe(struct i2c_cl
 	err = device_property_read_u32(&i2c->dev, "display-height-chars",
 			&lcd->height);
 	if (err)
-		goto fail2;
+		goto fail1;
 
 	err = device_property_read_u32(&i2c->dev, "display-width-chars",
 			&lcd->width);
 	if (err)
-		goto fail2;
+		goto fail1;
 
 	lcd->ops = &lcd2s_ops;
 
 	err = charlcd_register(lcd2s->charlcd);
 	if (err)
-		goto fail2;
+		goto fail1;
 
 	i2c_set_clientdata(i2c, lcd2s);
 	return 0;
 
-fail2:
-	kfree(lcd2s);
 fail1:
 	kfree(lcd);
 	return err;