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

From: Herton Ronaldo Krzesinski
Date: Thu Dec 13 2012 - 09:01:13 EST


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

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

From: Johannes Berg <johannes.berg@xxxxxxxxx>

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@xxxxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@xxxxxxxxxxxxx>
---
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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