linux-kernel - [PATCH 5.15 557/667] staging: r8188eu: prevent ->Ssid overflow in rtw_wx_set

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220607164951.405242820@linuxfoundation.org>
Date:   Tue,  7 Jun 2022 19:03:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Denis Efremov <denis.e.efremov@...cle.com>
Subject: [PATCH 5.15 557/667] staging: r8188eu: prevent ->Ssid overflow in rtw_wx_set_scan()

From: Denis Efremov <denis.e.efremov@...cle.com>

commit bc10916e890948d8927a5c8c40fb5dc44be5e1b8 upstream.

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: 2b42bd58b321 ("staging: r8188eu: introduce new os_dep dir for RTL8188eu driver")
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Denis Efremov <denis.e.efremov@...cle.com>
Link: https://lore.kernel.org/r/20220518070052.108287-1-denis.e.efremov@oracle.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/staging/r8188eu/os_dep/ioctl_linux.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c
+++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
@@ -1249,9 +1249,11 @@ static int rtw_wx_set_scan(struct net_de
 						break;
 					}
 					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);
 						ssid_index++;
 					}
 					pos += sec_len;