From 5cc2ac840e36a3342c5194c20b314f0bb95ef7e1 Mon Sep 17 00:00:00 2001
From: Nishank Aggarwal <naggar@codeaurora.org>
Date: Thu, 12 Jan 2017 14:32:02 +0530
Subject: qcacld-2.0: Fix buffer overflow in WLANSAP_Set_WPARSNIes()

Currently In WLANSAP_Set_WPARSNIes() the parameter WPARSNIEsLen
is user-controllable and never validates which uses as the length
for a memory copy. This enables user-space applications to corrupt
heap memory and potentially crash the kernel.

Fix is to validate the WPARSNIes length to its max before use as the
length for a memory copy.

Change-Id: I7aff731aeae22bfd84beb955439a799abef37f68
CRs-Fixed: 1102648
---
 CORE/HDD/src/wlan_hdd_hostapd.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/CORE/HDD/src/wlan_hdd_hostapd.c b/CORE/HDD/src/wlan_hdd_hostapd.c
index 693c0c9..59b32f2 100644
--- a/CORE/HDD/src/wlan_hdd_hostapd.c
+++ b/CORE/HDD/src/wlan_hdd_hostapd.c
@@ -6099,6 +6099,13 @@ static int __iw_set_ap_genie(struct net_device *dev,
         return 0;
     }
 
+    if (wrqu->data.length > DOT11F_IE_RSN_MAX_LEN) {
+       VOS_TRACE(VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
+               "%s: WPARSN Ie input length is more than max[%d]", __func__,
+                wrqu->data.length);
+       return -EINVAL;
+    }
+
     switch (genie[0])
     {
         case DOT11F_EID_WPA:
-- 
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