patch "staging: rtl8192u: fix ->ssid overflow in r8192_wx_set_scan()" added to staging-linus

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

    staging: rtl8192u: fix ->ssid overflow in r8192_wx_set_scan()

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 3b897cb890d5cfb8111987b10f675525cacdab2a Mon Sep 17 00:00:00 2001
From: Dan Carpenter <[email protected]>
Date: Fri, 5 Mar 2021 11:12:49 +0300
Subject: staging: rtl8192u: fix ->ssid overflow in r8192_wx_set_scan()

We need to cap len at IW_ESSID_MAX_SIZE (32) to avoid memory corruption. This can be controlled by the user via the ioctl.

---
 drivers/staging/rtl8192u/r8192U_wx.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

index d853586705fc..77bf88696a84 100644
@@ -331,8 +331,10 @@ static int r8192_wx_set_scan(struct net_device *dev, struct iw_request_info *a,
 		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