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cfg80211: fix scheduled scan pointer access

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commit 79845c662e upstream.

Since rdev->sched_scan_req is dereferenced outside the
lock protecting it, this might be done at the wrong
time, causing crashes. Move the dereference to where
it should be - inside the RTNL locked section.

Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johannes Berg 2013-10-21 11:33:35 +02:00 committed by Greg Kroah-Hartman
parent 7c5f3874d9
commit f98c4b05dc
1 changed files with 2 additions and 2 deletions
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4
net/wireless/scan.c
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@ -253,10 +253,10 @@ void __cfg80211_sched_scan_results(struct work_struct *wk)
rdev = container_of(wk, struct cfg80211_registered_device,
sched_scan_results_wk);
request = rdev->sched_scan_req;
mutex_lock(&rdev->sched_scan_mtx);
request = rdev->sched_scan_req;
/* we don't have sched_scan_req anymore if the scan is stopping */
if (request) {
if (request->flags & NL80211_SCAN_FLAG_FLUSH) {