Author: avos
Date: Tue Apr 19 20:19:21 2016
New Revision: 298293
URL: https://svnweb.freebsd.org/changeset/base/298293
Log:
net80211: do not reschedule scan_curchan_task() if the scan was canceled.
This should fix possible use-after-free in the scheduled task.
PR: 208605
Modified:
head/sys/net80211/ieee80211_scan_sw.c
Modified: head/sys/net80211/ieee80211_scan_sw.c
==============================================================================
--- head/sys/net80211/ieee80211_scan_sw.c Tue Apr 19 20:12:46 2016
(r298292)
+++ head/sys/net80211/ieee80211_scan_sw.c Tue Apr 19 20:19:21 2016
(r298293)
@@ -736,8 +736,11 @@ end:
/* clear mindwell lock and initial channel change flush */
ss_priv->ss_iflags &= ~ISCAN_REP;
- if (ss_priv->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT))
+ if (ss_priv->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT)) {
+ taskqueue_cancel_timeout(ic->ic_tq, &ss_priv->ss_scan_curchan,
+ NULL);
goto end;
+ }
IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, "%s: waiting\n",
__func__);
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