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-rw-r--r--include/net/cfg80211.h9
-rw-r--r--net/mac80211/rx.c32
-rw-r--r--net/wireless/util.c3
3 files changed, 42 insertions, 2 deletions
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index f10553c938a6..fb5204bc5c0e 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2633,6 +2633,15 @@ unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb);
unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc);
/**
+ * ieee80211_get_mesh_hdrlen - get mesh extension header length
+ * @meshhdr: the mesh extension header, only the flags field
+ * (first byte) will be accessed
+ * Returns the length of the extension header, which is always at
+ * least 6 bytes and at most 18 if address 5 and 6 are present.
+ */
+unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr);
+
+/**
* DOC: Data path helpers
*
* In addition to generic utilities, cfg80211 also offers
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 3d8089b7fb5f..6bd9ff8a8349 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -491,6 +491,11 @@ ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx)
if (ieee80211_is_action(hdr->frame_control)) {
u8 category;
+
+ /* make sure category field is present */
+ if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE)
+ return RX_DROP_MONITOR;
+
mgmt = (struct ieee80211_mgmt *)hdr;
category = mgmt->u.action.category;
if (category != WLAN_CATEGORY_MESH_ACTION &&
@@ -1852,6 +1857,20 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
hdr = (struct ieee80211_hdr *) skb->data;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
+
+ /* make sure fixed part of mesh header is there, also checks skb len */
+ if (!pskb_may_pull(rx->skb, hdrlen + 6))
+ return RX_DROP_MONITOR;
+
+ mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
+
+ /* make sure full mesh header is there, also checks skb len */
+ if (!pskb_may_pull(rx->skb,
+ hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr)))
+ return RX_DROP_MONITOR;
+
+ /* reload pointers */
+ hdr = (struct ieee80211_hdr *) skb->data;
mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen);
/* frame is in RMC, don't forward */
@@ -1875,9 +1894,12 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
if (is_multicast_ether_addr(hdr->addr1)) {
mpp_addr = hdr->addr3;
proxied_addr = mesh_hdr->eaddr1;
- } else {
+ } else if (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6) {
+ /* has_a4 already checked in ieee80211_rx_mesh_check */
mpp_addr = hdr->addr4;
proxied_addr = mesh_hdr->eaddr2;
+ } else {
+ return RX_DROP_MONITOR;
}
rcu_read_lock();
@@ -2314,6 +2336,10 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
}
break;
case WLAN_CATEGORY_SELF_PROTECTED:
+ if (len < (IEEE80211_MIN_ACTION_SIZE +
+ sizeof(mgmt->u.action.u.self_prot.action_code)))
+ break;
+
switch (mgmt->u.action.u.self_prot.action_code) {
case WLAN_SP_MESH_PEERING_OPEN:
case WLAN_SP_MESH_PEERING_CLOSE:
@@ -2332,6 +2358,10 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
}
break;
case WLAN_CATEGORY_MESH_ACTION:
+ if (len < (IEEE80211_MIN_ACTION_SIZE +
+ sizeof(mgmt->u.action.u.mesh_action.action_code)))
+ break;
+
if (!ieee80211_vif_is_mesh(&sdata->vif))
break;
if (mesh_action_is_path_sel(mgmt) &&
diff --git a/net/wireless/util.c b/net/wireless/util.c
index 5b88ff2d6a67..09afde73c8e1 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -309,7 +309,7 @@ unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
}
EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
-static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
+unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
{
int ae = meshhdr->flags & MESH_FLAGS_AE;
/* 802.11-2012, 8.2.4.7.3 */
@@ -323,6 +323,7 @@ static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
return 18;
}
}
+EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
enum nl80211_iftype iftype)