linux-kernel - [PATCH] auxdisplay: hd44780: Fix potential memory leak in hd44780

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Date:   Mon,  4 Jul 2022 09:27:09 +0800
From:   Jianglei Nie <niejianglei2021@....com>
To:     ojeda@...nel.org
Cc:     linux-kernel@...r.kernel.org,
        Jianglei Nie <niejianglei2021@....com>
Subject: [PATCH] auxdisplay: hd44780: Fix potential memory leak in hd44780_remove()

hd44780_probe() allocates a memory chunk for hd with kzalloc() and
makes "lcd->drvdata->hd44780" point to it. When we call hd44780_remove(),
we should release all relevant memory and resource, but "lcd->drvdata
->hd44780" is not released, which will lead to a memory leak.

We should release the "lcd->drvdata->hd44780" in hd44780_remove() to fix
the memory leak bug.

Signed-off-by: Jianglei Nie <niejianglei2021@....com>
---
 drivers/auxdisplay/hd44780.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index 8b2a0eb3f32a..8940a93d2d4d 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -324,6 +324,7 @@ static int hd44780_remove(struct platform_device *pdev)
 	struct charlcd *lcd = platform_get_drvdata(pdev);
 
 	charlcd_unregister(lcd);
+	kfree(lcd->drvdata->hd44780);
 	kfree(lcd->drvdata);
 
 	kfree(lcd);
-- 
2.25.1