linux-kernel - [PATCH] staging: r8188eu: fix a memory leak in rtw_mp

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Message-Id: <20211209073421.126251-1-niejianglei2021@163.com>
Date:   Thu,  9 Dec 2021 15:34:21 +0800
From:   Jianglei Nie <niejianglei2021@....com>
To:     Larry.Finger@...inger.net, phil@...lpotter.co.uk,
        gregkh@...uxfoundation.org, straube.linux@...il.com,
        martin@...ser.cx
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Jianglei Nie <niejianglei2021@....com>
Subject: [PATCH] staging: r8188eu: fix a memory leak in rtw_mp_QueryDrv()

Line 6183 (#1) allocates a memory chunk for input by kmalloc().
Line 6204 (#3) frees the input before the function returns while
line 6190 (#2) forget to free it, which will lead to a memory leak.

We should kfree() input in line 6190 (#2).

6177 static int rtw_mp_QueryDrv(struct net_device *dev,
6178 			struct iw_request_info *info,
6179 			union iwreq_data *wrqu, char *extra)
6180 {
6182	char	*input = kmalloc(wrqu->data.length, GFP_KERNEL);
	// #1: kmalloc space

6186	if (!input)
6187		return -ENOMEM;

6189 	if (copy_from_user(input, wrqu->data.pointer, wrqu->data.length))
6190 			return -EFAULT; // #2: missing kfree

6204 	kfree(input); // #3: kfree space
6205 	return 0;
6206 }

Signed-off-by: Jianglei Nie <niejianglei2021@....com>
---
 drivers/staging/r8188eu/os_dep/ioctl_linux.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/r8188eu/os_dep/ioctl_linux.c b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
index 1fd375076001..0524523910f0 100644
--- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c
+++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
@@ -6186,8 +6186,11 @@ static int rtw_mp_QueryDrv(struct net_device *dev,
 	if (!input)
 		return -ENOMEM;
 
-	if (copy_from_user(input, wrqu->data.pointer, wrqu->data.length))
-			return -EFAULT;
+	if (copy_from_user(input, wrqu->data.pointer, wrqu->data.length)) {
+		kfree(input);
+		return -EFAULT;
+	}
+
 	DBG_88E("%s:iwpriv in =%s\n", __func__, input);
 
 	qAutoLoad = strncmp(input, "autoload", 8); /*  strncmp true is 0 */
-- 
2.25.1