DivestOS/Patches/Linux_CVEs/CVE-2017-0461/ANY/1.patch

From 02bd3c61ccb5a68eee42e6cfc59fc8d7120167a2 Mon Sep 17 00:00:00 2001
From: Pothula Hanumantha Reddy <c_hpothu@codeaurora.org>
Date: Wed, 28 Dec 2016 17:55:19 +0530
Subject: prima: Fix array out-of-bounds & integer underflow in _iw_set_genie

qcacld-2.0 to prima propagation

'wrqu->data.length' holds the total number of IE data buffer.
Add a check to make sure the number of remaining data to be read is
greater than or equal to IE length.
Also, advance the buffer pointer to point to the next element only
if next element is present.

Change-Id: Ic60f3e0650f365955dab4099eb8740e9789e00cc
CRs-Fixed: 1100132
---
 CORE/HDD/src/wlan_hdd_wext.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/CORE/HDD/src/wlan_hdd_wext.c b/CORE/HDD/src/wlan_hdd_wext.c
index 07d2e6b..91bc35c 100644
--- a/CORE/HDD/src/wlan_hdd_wext.c
+++ b/CORE/HDD/src/wlan_hdd_wext.c
@@ -2565,6 +2565,13 @@ static int __iw_set_genie(struct net_device *dev,
         hddLog(VOS_TRACE_LEVEL_INFO, "%s: IE[0x%X], LEN[%d]",
             __func__, elementId, eLen);
 
+        if (remLen < eLen) {
+            hddLog(LOGE, "Remaining len: %u less than ie len: %u",
+                   remLen, eLen);
+            ret = -EINVAL;
+            goto exit;
+        }
+
         switch ( elementId )
          {
             case IE_EID_VENDOR:
@@ -2647,8 +2654,11 @@ static int __iw_set_genie(struct net_device *dev,
                 hddLog (LOGE, "%s Set UNKNOWN IE %X",__func__, elementId);
                 goto exit;
     }
-        genie += eLen;
         remLen -= eLen;
+
+        /* Move genie only if next element is present */
+        if (remLen >= 2)
+            genie += eLen;
     }
 
 exit:
-- 
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