mac80211: fix remain-on-channel cancel crash

If a ROC item is canceled just as it expires, the work
struct may be scheduled while it is running (and waiting
for the mutex). This results in it being run after being
freed, which obviously crashes.

To fix this don't free it when aborting is requested but
instead mark it as "to be freed", which makes the work a
no-op and allows freeing it outside.

Cc: stable@vger.kernel.org [3.6+]
Reported-by: Jouni Malinen <j@w1.fi>
Tested-by: Jouni Malinen <j@w1.fi>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index fb306814576affa7e636fa53353d29ba1e39b668..a6893602f87a753ebafeae0d0b8f449bdc7251f7 100644 (file)
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -2582,7 +2582,7 @@ static int ieee80211_cancel_roc(struct ieee80211_local *local,
                        list_del(&dep->list);
                        mutex_unlock(&local->mtx);
 
-                       ieee80211_roc_notify_destroy(dep);
+                       ieee80211_roc_notify_destroy(dep, true);
                        return 0;
                }
 
@@ -2622,7 +2622,7 @@ static int ieee80211_cancel_roc(struct ieee80211_local *local,
                        ieee80211_start_next_roc(local);
                mutex_unlock(&local->mtx);
 
-               ieee80211_roc_notify_destroy(found);
+               ieee80211_roc_notify_destroy(found, true);
        } else {
                /* work may be pending so use it all the time */
                found->abort = true;
@@ -2632,6 +2632,8 @@ static int ieee80211_cancel_roc(struct ieee80211_local *local,
 
                /* work will clean up etc */
                flush_delayed_work(&found->work);
+               WARN_ON(!found->to_be_freed);
+               kfree(found);
        }
 
        return 0;

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 388580a1badad2acec84893fe6ec652f8ce24b6c..7bdefd901f9d73393c9c5f3453534bb63d469966 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -309,6 +309,7 @@ struct ieee80211_roc_work {
        struct ieee80211_channel *chan;
 
        bool started, abort, hw_begun, notified;
+       bool to_be_freed;
 
        unsigned long hw_start_time;
 
@@ -1347,7 +1348,7 @@ void ieee80211_offchannel_return(struct ieee80211_local *local);
 void ieee80211_roc_setup(struct ieee80211_local *local);
 void ieee80211_start_next_roc(struct ieee80211_local *local);
 void ieee80211_roc_purge(struct ieee80211_sub_if_data *sdata);
-void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc);
+void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc, bool free);
 void ieee80211_sw_roc_work(struct work_struct *work);
 void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc);
 

diff --git a/net/mac80211/offchannel.c b/net/mac80211/offchannel.c
index cc79b4a2e821c9232c41135da3f4397dbba67b8d..430bd254e49693bf7e62744843fff8c10a2acb9a 100644 (file)
--- a/net/mac80211/offchannel.c
+++ b/net/mac80211/offchannel.c
@@ -297,10 +297,13 @@ void ieee80211_start_next_roc(struct ieee80211_local *local)
        }
 }
 
-void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc)
+void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc, bool free)
 {
        struct ieee80211_roc_work *dep, *tmp;
 
+       if (WARN_ON(roc->to_be_freed))
+               return;
+
        /* was never transmitted */
        if (roc->frame) {
                cfg80211_mgmt_tx_status(&roc->sdata->wdev,
@@ -316,9 +319,12 @@ void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc)
                                                   GFP_KERNEL);
 
        list_for_each_entry_safe(dep, tmp, &roc->dependents, list)
-               ieee80211_roc_notify_destroy(dep);
+               ieee80211_roc_notify_destroy(dep, true);
 
-       kfree(roc);
+       if (free)
+               kfree(roc);
+       else
+               roc->to_be_freed = true;
 }
 
 void ieee80211_sw_roc_work(struct work_struct *work)
@@ -331,6 +337,9 @@ void ieee80211_sw_roc_work(struct work_struct *work)
 
        mutex_lock(&local->mtx);
 
+       if (roc->to_be_freed)
+               goto out_unlock;
+
        if (roc->abort)
                goto finish;
 
@@ -370,7 +379,7 @@ void ieee80211_sw_roc_work(struct work_struct *work)
  finish:
                list_del(&roc->list);
                started = roc->started;
-               ieee80211_roc_notify_destroy(roc);
+               ieee80211_roc_notify_destroy(roc, !roc->abort);
 
                if (started) {
                        drv_flush(local, false);
@@ -410,7 +419,7 @@ static void ieee80211_hw_roc_done(struct work_struct *work)
 
        list_del(&roc->list);
 
-       ieee80211_roc_notify_destroy(roc);
+       ieee80211_roc_notify_destroy(roc, true);
 
        /* if there's another roc, start it now */
        ieee80211_start_next_roc(local);
@@ -460,12 +469,14 @@ void ieee80211_roc_purge(struct ieee80211_sub_if_data *sdata)
        list_for_each_entry_safe(roc, tmp, &tmp_list, list) {
                if (local->ops->remain_on_channel) {
                        list_del(&roc->list);
-                       ieee80211_roc_notify_destroy(roc);
+                       ieee80211_roc_notify_destroy(roc, true);
                } else {
                        ieee80211_queue_delayed_work(&local->hw, &roc->work, 0);
 
                        /* work will clean up etc */
                        flush_delayed_work(&roc->work);
+                       WARN_ON(!roc->to_be_freed);
+                       kfree(roc);
                }
        }