linux-kernel - [PATCH] staging: r8188eu: Use memdup_user instead of kmalloc/copy_from

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Message-Id: <20211210033832.40428-1-jiapeng.chong@linux.alibaba.com>
Date:   Fri, 10 Dec 2021 11:38:32 +0800
From:   Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
To:     Larry.Finger@...inger.net
Cc:     phil@...lpotter.co.uk, gregkh@...uxfoundation.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
        Abaci Robot <abaci@...ux.alibaba.com>
Subject: [PATCH] staging: r8188eu: Use memdup_user instead of kmalloc/copy_from_user

Fix following coccicheck warning:

./drivers/staging/r8188eu/os_dep/ioctl_linux.c:4253:8-15: WARNING
opportunity for memdup_user.

Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
---
 drivers/staging/r8188eu/os_dep/ioctl_linux.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/staging/r8188eu/os_dep/ioctl_linux.c b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
index 56adfe4087a8..c6a2fbfe8f26 100644
--- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c
+++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
@@ -4250,17 +4250,12 @@ static int rtw_test(
 	DBG_88E("+%s\n", __func__);
 	len = wrqu->data.length;
 
-	pbuf = kzalloc(len, GFP_KERNEL);
-	if (!pbuf) {
-		DBG_88E("%s: no memory!\n", __func__);
-		return -ENOMEM;
-	}
-
-	if (copy_from_user(pbuf, wrqu->data.pointer, len)) {
-		kfree(pbuf);
+	pbuf = memdup_user(wrqu->data.pointer, len);
+	if (IS_ERR(pbuf)) {
 		DBG_88E("%s: copy from user fail!\n", __func__);
-		return -EFAULT;
+		return PTR_ERR(pbuf);
 	}
+
 	DBG_88E("%s: string =\"%s\"\n", __func__, pbuf);
 
 	ptmp = (char *)pbuf;
-- 
2.34.0