mac80211: verify that skb data is present

commit 9b395bc3be1cebf0144a127c7e67d56dbdac0930 upstream.

A number of places in the mesh code don't check that
the frame data is present and in the skb header when
trying to access. Add those checks and the necessary
pskb_may_pull() calls. This prevents accessing data
that doesn't actually exist.

To do this, export ieee80211_get_mesh_hdrlen() to be
able to use it in mac80211.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 95852e36713b5e302e365033957d16910de01952..19d632d46b609e04fef0e5b9c915d7fab8dc7fa1 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2430,6 +2430,15 @@ 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
  *

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index f9f8f36f42fa3dd55797a05f0a43721b9555cb82..348cfa8aacc61c7155010330aa79f271a48dce4d 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -515,6 +515,11 @@ 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 &&
@@ -1890,6 +1895,20 @@ 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 */
@@ -1920,9 +1939,12 @@ 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();
@@ -2299,6 +2321,10 @@ 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:
@@ -2317,6 +2343,10 @@ 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 61a09e3df677c4a6009d1643bcbc03f5d11123da..5fba039ca6ddf793aecb545d00c230631c512d1f 100644 (file)
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -301,7 +301,7 @@ 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 */
@@ -315,6 +315,7 @@ 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)