From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Arunk Khandavalli , Jouni Malinen , Johannes Berg , Sasha Levin Subject: [PATCH 4.18 037/168] cfg80211: nl80211_update_ft_ies() to validate NL80211_ATTR_IE Date: Mon, 8 Oct 2018 20:30:17 +0200 Message-Id: <20181008175621.456005756@linuxfoundation.org> In-Reply-To: <20181008175620.043587728@linuxfoundation.org> References: <20181008175620.043587728@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Arunk Khandavalli [ 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 Signed-off-by: Jouni Malinen Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- net/wireless/nl80211.c | 1 + 1 file changed, 1 insertion(+) --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -12099,6 +12099,7 @@ static int nl80211_update_ft_ies(struct return -EOPNOTSUPP; if (!info->attrs[NL80211_ATTR_MDID] || + !info->attrs[NL80211_ATTR_IE] || !is_valid_ie_attr(info->attrs[NL80211_ATTR_IE])) return -EINVAL;