linux-kernel - [PATCH 3.18 07/28] cfg80211: Validate frequencies nested in NL80211_ATTR_SCAN

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Date:   Wed, 19 Jul 2017 13:15:35 +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, Srinivas Dasari <dasaris@....qualcomm.com>,
        Jouni Malinen <jouni@....qualcomm.com>,
        Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 3.18 07/28] cfg80211: Validate frequencies nested in NL80211_ATTR_SCAN_FREQUENCIES

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Srinivas Dasari <dasaris@....qualcomm.com>

commit d7f13f7450369281a5d0ea463cc69890a15923ae upstream.

validate_scan_freqs() retrieves frequencies from attributes
nested in the attribute NL80211_ATTR_SCAN_FREQUENCIES with
nla_get_u32(), which reads 4 bytes from each attribute
without validating the size of data received. Attributes
nested in NL80211_ATTR_SCAN_FREQUENCIES don't have an nla policy.

Validate size of each attribute before parsing to avoid potential buffer
overread.

Fixes: 2a519311926 ("cfg80211/nl80211: scanning (and mac80211 update to use it)")
Signed-off-by: Srinivas Dasari <dasaris@....qualcomm.com>
Signed-off-by: Jouni Malinen <jouni@....qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/wireless/nl80211.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -5348,6 +5348,10 @@ static int validate_scan_freqs(struct nl
 	struct nlattr *attr1, *attr2;
 	int n_channels = 0, tmp1, tmp2;
 
+	nla_for_each_nested(attr1, freqs, tmp1)
+		if (nla_len(attr1) != sizeof(u32))
+			return 0;
+
 	nla_for_each_nested(attr1, freqs, tmp1) {
 		n_channels++;
 		/*