wifi: mac80211: fix RCU use in TDLS fast-xmit

[platform/kernel/linux-rpi.git] / net / mac80211 / tx.c

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index d45d4be..5481acb 100644 (file)
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -3086,10 +3086,11 @@ void ieee80211_check_fast_xmit(struct sta_info *sta)
                        /* DA SA BSSID */
                        build.da_offs = offsetof(struct ieee80211_hdr, addr1);
                        build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
+                       rcu_read_lock();
                        link = rcu_dereference(sdata->link[tdls_link_id]);
-                       if (WARN_ON_ONCE(!link))
-                               break;
-                       memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN);
+                       if (!WARN_ON_ONCE(!link))
+                               memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN);
+                       rcu_read_unlock();
                        build.hdr_len = 24;
                        break;
                }