From: Arunk Khandavalli <akhandav@codeaurora.org>
Date: Wed, 29 Aug 2018 21:40:16 +0000 (+0300)
Subject: cfg80211: nl80211_update_ft_ies() to validate NL80211_ATTR_IE
X-Git-Tag: v4.18.13~132
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=6f01b1a3c4ad4b9048d676b6cd2a8df9b6b49c0b;p=users%2Fdwmw2%2Flinux.git

cfg80211: nl80211_update_ft_ies() to validate NL80211_ATTR_IE

[ Upstream commit 4f0223bfe9c3e62d8f45a85f1ef1b18a8a263ef9 ]

nl80211_update_ft_ies() tried to validate NL80211_ATTR_IE with
is_valid_ie_attr() before dereferencing it, but that helper function
returns true in case of NULL pointer (i.e., attribute not included).
This can result to dereferencing a NULL pointer. Fix that by explicitly
checking that NL80211_ATTR_IE is included.

Fixes: 355199e02b83 ("cfg80211: Extend support for IEEE 802.11r Fast BSS Transition")
Signed-off-by: Arunk Khandavalli <akhandav@codeaurora.org>
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index ce0149a86c139..733ccf8679728 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -12099,6 +12099,7 @@ static int nl80211_update_ft_ies(struct sk_buff *skb, struct genl_info *info)
 		return -EOPNOTSUPP;
 
 	if (!info->attrs[NL80211_ATTR_MDID] ||
+	    !info->attrs[NL80211_ATTR_IE] ||
 	    !is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
 		return -EINVAL;