From ddf75a86aba2cfb7ec4497e8692b60c8c8fe0ee7 Mon Sep 17 00:00:00 2001
From: Jianglei Nie <niejianglei2021@163.com>
Date: Tue, 29 Nov 2022 16:15:42 +0800
Subject: [PATCH] auxdisplay: hd44780: Fix potential memory leak in hd44780_remove()
Git-commit: ddf75a86aba2cfb7ec4497e8692b60c8c8fe0ee7
Patch-mainline: v6.3-rc1
References: git-fixes

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.

Fixes: 718e05ed92ec ("auxdisplay: Introduce hd44780_common.[ch]")
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jianglei Nie <niejianglei2021@163.com>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/auxdisplay/hd44780.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index 8b2a0eb3f32a..d56a5d508ccd 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -322,8 +322,10 @@ static int hd44780_probe(struct platform_device *pdev)
 static int hd44780_remove(struct platform_device *pdev)
 {
 	struct charlcd *lcd = platform_get_drvdata(pdev);
+	struct hd44780_common *hdc = lcd->drvdata;
 
 	charlcd_unregister(lcd);
+	kfree(hdc->hd44780);
 	kfree(lcd->drvdata);
 
 	kfree(lcd);
-- 
2.35.3