Patch "staging: rtl8723bs: prevent ->Ssid overflow in rtw_wx_set_scan()" has been added to the 5.10-stable tree

[<gregkh@linuxfoundation.org>]

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

    staging: rtl8723bs: prevent ->Ssid overflow in rtw_wx_set_scan()

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     staging-rtl8723bs-prevent-ssid-overflow-in-rtw_wx_set_scan.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From efremov@linux.com  Thu May 26 14:03:56 2022
From: "Denis Efremov (Oracle)" <efremov@linux.com>
Date: Fri, 20 May 2022 07:57:30 +0400
Subject: staging: rtl8723bs: prevent ->Ssid overflow in rtw_wx_set_scan()
To: gregkh@linuxfoundation.org
Cc: "Denis Efremov (Oracle)" <efremov@linux.com>, Larry.Finger@lwfinger.net, phil@philpotter.co.uk, dan.carpenter@oracle.com, straube.linux@gmail.com, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, stable <stable@vger.kernel.org>
Message-ID: <20220520035730.5533-1-efremov@linux.com>

From: "Denis Efremov (Oracle)" <efremov@linux.com>

This code has a check to prevent read overflow but it needs another
check to prevent writing beyond the end of the ->Ssid[] array.

Fixes: 554c0a3abf21 ("staging: Add rtl8723bs sdio wifi driver")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Denis Efremov (Oracle) <efremov@linux.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/staging/rtl8723bs/os_dep/ioctl_linux.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
+++ b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
@@ -1351,9 +1351,11 @@ static int rtw_wx_set_scan(struct net_de
 
 					sec_len = *(pos++); len -= 1;
 
-					if (sec_len > 0 && sec_len <= len) {
+					if (sec_len > 0 &&
+					    sec_len <= len &&
+					    sec_len <= 32) {
 						ssid[ssid_index].SsidLength = sec_len;
-						memcpy(ssid[ssid_index].Ssid, pos, ssid[ssid_index].SsidLength);
+						memcpy(ssid[ssid_index].Ssid, pos, sec_len);
 						/* DBG_871X("%s COMBO_SCAN with specific ssid:%s, %d\n", __func__ */
 						/* 	, ssid[ssid_index].Ssid, ssid[ssid_index].SsidLength); */
 						ssid_index++;


Patches currently in stable-queue which might be from efremov@linux.com are

queue-5.10/staging-rtl8723bs-prevent-ssid-overflow-in-rtw_wx_set_scan.patch