patch "staging: rtl8192e: Fix possible buffer overflow in" added to staging-linus

This is a note to let you know that I've just added the patch titled

staging: rtl8192e: Fix possible buffer overflow in

to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 35eda75caac975e1912acdf9635f8f23c8e5db4e Mon Sep 17 00:00:00 2001
From: Lee Gibson <[email protected]>
Date: Fri, 26 Feb 2021 14:51:57 +0000
Subject: 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.

---
 drivers/staging/rtl8192e/rtl8192e/rtl_wx.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

index 16bcee13f64b..407effde5e71 100644
@@ -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);
 		}
 	}
 

2.30.1