[PATCH 012/241] mac80211: check management frame header length

[Herton Ronaldo Krzesinski]

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

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

From: Johannes Berg <johannes.berg at intel.com>

commit 4a4f1a5808c8bb0b72a4f6e5904c53fb8c9cd966 upstream.

Due to pskb_may_pull() checking the skb length, all
non-management frames are checked on input whether
their 802.11 header is fully present. Also add that
check for management frames and remove a check that
is now duplicate. This prevents accessing skb data
beyond the frame end.

Signed-off-by: Johannes Berg <johannes.berg at intel.com>
[ herton: unfuzz patch ]
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
 net/mac80211/rx.c |   12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 4e4fc93..38800d3 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1473,7 +1473,6 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
 	frag = sc & IEEE80211_SCTL_FRAG;
 
 	if (likely((!ieee80211_has_morefrags(fc) && frag == 0) ||
-		   (rx->skb)->len < 24 ||
 		   is_multicast_ether_addr(hdr->addr1))) {
 		/* not fragmented */
 		goto out;
@@ -2923,10 +2922,15 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw,
 		     test_bit(SCAN_SW_SCANNING, &local->scanning)))
 		status->rx_flags |= IEEE80211_RX_IN_SCAN;
 
-	if (ieee80211_is_mgmt(fc))
-		err = skb_linearize(skb);
-	else
+	if (ieee80211_is_mgmt(fc)) {
+		/* drop frame if too short for header */
+		if (skb->len < ieee80211_hdrlen(fc))
+			err = -ENOBUFS;
+		else
+			err = skb_linearize(skb);
+	} else {
 		err = !pskb_may_pull(skb, ieee80211_hdrlen(fc));
+	}
 
 	if (err) {
 		dev_kfree_skb(skb);
-- 
1.7.9.5