linux-kernel - [PATCH 011/241] wireless: drop invalid mesh address extension frames

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Message-Id: <1355407206-17100-12-git-send-email-herton.krzesinski@canonical.com>
Date:	Thu, 13 Dec 2012 11:56:16 -0200
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Johannes Berg <johannes.berg@...el.com>,
	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Subject: [PATCH 011/241] wireless: drop invalid mesh address extension frames

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

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

From: Johannes Berg <johannes.berg@...el.com>

commit 7dd111e8ee10cc6816669eabcad3334447673236 upstream.

The mesh header can have address extension by a 4th
or a 5th and 6th address, but never both. Drop such
frames in 802.11 -> 802.3 conversion along with any
frames that have the wrong extension.

Reviewed-by: Javier Cardona <javier@...ybit.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
---
 net/wireless/util.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/net/wireless/util.c b/net/wireless/util.c
index 6f13299..b3aeac4 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -293,18 +293,15 @@ EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 {
 	int ae = meshhdr->flags & MESH_FLAGS_AE;
-	/* 7.1.3.5a.2 */
+	/* 802.11-2012, 8.2.4.7.3 */
 	switch (ae) {
+	default:
 	case 0:
 		return 6;
 	case MESH_FLAGS_AE_A4:
 		return 12;
 	case MESH_FLAGS_AE_A5_A6:
 		return 18;
-	case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
-		return 24;
-	default:
-		return 6;
 	}
 }
 
@@ -354,6 +351,8 @@ int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 			/* make sure meshdr->flags is on the linear part */
 			if (!pskb_may_pull(skb, hdrlen + 1))
 				return -1;
+			if (meshdr->flags & MESH_FLAGS_AE_A4)
+				return -1;
 			if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
 				skb_copy_bits(skb, hdrlen +
 					offsetof(struct ieee80211s_hdr, eaddr1),
@@ -378,6 +377,8 @@ int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 			/* make sure meshdr->flags is on the linear part */
 			if (!pskb_may_pull(skb, hdrlen + 1))
 				return -1;
+			if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
+				return -1;
 			if (meshdr->flags & MESH_FLAGS_AE_A4)
 				skb_copy_bits(skb, hdrlen +
 					offsetof(struct ieee80211s_hdr, eaddr1),
-- 
1.7.9.5

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