2 files changed, 36 insertions, 18 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index c5d16f299d6f..a3f0a7ed31ac 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1658,6 +1658,22 @@ void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
  */
 unsigned int cfg80211_classify8021d(struct sk_buff *skb);
 
+/**
+ * cfg80211_find_ie - find information element in data
+ *
+ * @eid: element ID
+ * @ies: data consisting of IEs
+ * @len: length of data
+ *
+ * This function will return %NULL if the element ID could
+ * not be found or if the element is invalid (claims to be
+ * longer than the given data), or a pointer to the first byte
+ * of the requested element, that is the byte containing the
+ * element ID. There are no checks on the element length
+ * other than having to fit into the given data.
+ */
+const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len);
+
 /*
  * Regulatory helper functions for wiphys
  */
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 06b0231ee5e3..978cac3414b5 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -143,9 +143,9 @@ void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
                 dev->bss_generation++;
 }
 
-static u8 *find_ie(u8 num, u8 *ies, int len)
+const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
 {
-        while (len > 2 && ies[0] != num) {
+        while (len > 2 && ies[0] != eid) {
                 len -= ies[1] + 2;
                 ies += ies[1] + 2;
         }
@@ -155,11 +155,12 @@ static u8 *find_ie(u8 num, u8 *ies, int len)
                 return NULL;
         return ies;
 }
+EXPORT_SYMBOL(cfg80211_find_ie);
 
 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
 {
-        const u8 *ie1 = find_ie(num, ies1, len1);
-        const u8 *ie2 = find_ie(num, ies2, len2);
+        const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
+        const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
         int r;
 
         if (!ie1 && !ie2)
@@ -185,9 +186,9 @@ static bool is_bss(struct cfg80211_bss *a,
         if (!ssid)
                 return true;
 
-        ssidie = find_ie(WLAN_EID_SSID,
-                         a->information_elements,
-                         a->len_information_elements);
+        ssidie = cfg80211_find_ie(WLAN_EID_SSID,
+                                  a->information_elements,
+                                  a->len_information_elements);
         if (!ssidie)
                 return false;
         if (ssidie[1] != ssid_len)
@@ -204,9 +205,9 @@ static bool is_mesh(struct cfg80211_bss *a,
         if (!is_zero_ether_addr(a->bssid))
                 return false;
 
-        ie = find_ie(WLAN_EID_MESH_ID,
-                     a->information_elements,
-                     a->len_information_elements);
+        ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
+                              a->information_elements,
+                              a->len_information_elements);
         if (!ie)
                 return false;
         if (ie[1] != meshidlen)
@@ -214,9 +215,9 @@ static bool is_mesh(struct cfg80211_bss *a,
         if (memcmp(ie + 2, meshid, meshidlen))
                 return false;
 
-        ie = find_ie(WLAN_EID_MESH_CONFIG,
-                     a->information_elements,
-                     a->len_information_elements);
+        ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
+                              a->information_elements,
+                              a->len_information_elements);
         if (!ie)
                 return false;
         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
@@ -395,11 +396,12 @@ cfg80211_bss_update(struct cfg80211_registered_device *dev,
 
         if (is_zero_ether_addr(res->pub.bssid)) {
                 /* must be mesh, verify */
-                meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements,
-                                 res->pub.len_information_elements);
-                meshcfg = find_ie(WLAN_EID_MESH_CONFIG,
-                                  res->pub.information_elements,
-                                  res->pub.len_information_elements);
+                meshid = cfg80211_find_ie(WLAN_EID_MESH_ID,
+                                          res->pub.information_elements,
+                                          res->pub.len_information_elements);
+                meshcfg = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
+                                           res->pub.information_elements,
+                                           res->pub.len_information_elements);
                 if (!meshid || !meshcfg ||
                     meshcfg[1] != sizeof(struct ieee80211_meshconf_ie)) {
                         /* bogus mesh */