From a43816df2a1a61effcb701037bdf63621d066182 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 10 Jul 2009 11:39:26 +0200 Subject: [PATCH] mac80211: mesh: fix two small problems 1) there's a spin_lock() that needs to be spin_lock_bh() 2) action frames of size 24 might cause an out-of-bounds memory access (for the 25th byte only, so no big deal) Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- net/mac80211/mesh.c | 5 ++++- net/mac80211/mesh_hwmp.c | 6 +++--- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c index 542ea025494..8a97b142308 100644 --- a/net/mac80211/mesh.c +++ b/net/mac80211/mesh.c @@ -685,9 +685,12 @@ ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) fc = le16_to_cpu(mgmt->frame_control); switch (fc & IEEE80211_FCTL_STYPE) { + case IEEE80211_STYPE_ACTION: + if (skb->len < IEEE80211_MIN_ACTION_SIZE) + return RX_DROP_MONITOR; + /* fall through */ case IEEE80211_STYPE_PROBE_RESP: case IEEE80211_STYPE_BEACON: - case IEEE80211_STYPE_ACTION: skb_queue_tail(&ifmsh->skb_queue, skb); queue_work(local->hw.workqueue, &ifmsh->work); return RX_QUEUED; diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c index f49ef288e2e..8e86e910edf 100644 --- a/net/mac80211/mesh_hwmp.c +++ b/net/mac80211/mesh_hwmp.c @@ -686,11 +686,11 @@ void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) u8 ttl, dst_flags; u32 lifetime; - spin_lock(&ifmsh->mesh_preq_queue_lock); + spin_lock_bh(&ifmsh->mesh_preq_queue_lock); if (!ifmsh->preq_queue_len || time_before(jiffies, ifmsh->last_preq + min_preq_int_jiff(sdata))) { - spin_unlock(&ifmsh->mesh_preq_queue_lock); + spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); return; } @@ -698,7 +698,7 @@ void mesh_path_start_discovery(struct ieee80211_sub_if_data *sdata) struct mesh_preq_queue, list); list_del(&preq_node->list); --ifmsh->preq_queue_len; - spin_unlock(&ifmsh->mesh_preq_queue_lock); + spin_unlock_bh(&ifmsh->mesh_preq_queue_lock); rcu_read_lock(); mpath = mesh_path_lookup(preq_node->dst, sdata); -- 2.46.0