linux-kernel - [PATCH v3] staging: rtl8192e: Fix possible buffer overflow in _rtl92e_wx_set

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Message-Id: <20210226145157.424065-1-leegib@gmail.com>
Date:   Fri, 26 Feb 2021 14:51:57 +0000
From:   Lee Gibson <leegib@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     dan.carpenter@...cle.com, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, Lee Gibson <leegib@...il.com>
Subject: [PATCH v3] staging: rtl8192e: Fix possible buffer overflow in _rtl92e_wx_set_scan

Function _rtl92e_wx_set_scan calls memcpy without checking the length.
A user could control that length and trigger a buffer overflow.
Fix by checking the length is within the maximum allowed size.

Reviewed-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Lee Gibson <leegib@...il.com>
---
 drivers/staging/rtl8192e/rtl8192e/rtl_wx.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c b/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c
index 16bcee13f64b..407effde5e71 100644
--- a/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c
+++ b/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c
@@ -406,9 +406,10 @@ static int _rtl92e_wx_set_scan(struct net_device *dev,
 		struct iw_scan_req *req = (struct iw_scan_req *)b;
 
 		if (req->essid_len) {
-			ieee->current_network.ssid_len = req->essid_len;
-			memcpy(ieee->current_network.ssid, req->essid,
-			       req->essid_len);
+			int len = min_t(int, req->essid_len, IW_ESSID_MAX_SIZE);
+
+			ieee->current_network.ssid_len = len;
+			memcpy(ieee->current_network.ssid, req->essid, len);
 		}
 	}
 
-- 
2.25.1