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mac80211: fix use after free

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roc is destroyed then roc->started is referenced. Keep a local cache.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Alan Cox 2012-07-13 16:14:45 +02:00 committed by Johannes Berg
parent ae33bd817a
commit 4b4b8229ae
1 changed files with 4 additions and 2 deletions
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6
net/mac80211/offchannel.c
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@ -324,6 +324,7 @@ void ieee80211_sw_roc_work(struct work_struct *work)
container_of(work, struct ieee80211_roc_work, work.work); container_of(work, struct ieee80211_roc_work, work.work);
struct ieee80211_sub_if_data *sdata = roc->sdata; struct ieee80211_sub_if_data *sdata = roc->sdata;
struct ieee80211_local *local = sdata->local; struct ieee80211_local *local = sdata->local;
bool started;
mutex_lock(&local->mtx); mutex_lock(&local->mtx);
@ -366,9 +367,10 @@ void ieee80211_sw_roc_work(struct work_struct *work)
/* finish this ROC */ /* finish this ROC */
finish: finish:
list_del(&roc->list); list_del(&roc->list);
started = roc->started;
ieee80211_roc_notify_destroy(roc); ieee80211_roc_notify_destroy(roc);
if (roc->started) { if (started) {
drv_flush(local, false); drv_flush(local, false);
local->tmp_channel = NULL; local->tmp_channel = NULL;
@ -379,7 +381,7 @@ void ieee80211_sw_roc_work(struct work_struct *work)
ieee80211_recalc_idle(local); ieee80211_recalc_idle(local);
if (roc->started) if (started)
ieee80211_start_next_roc(local); ieee80211_start_next_roc(local);
} }