cfg80211: fix scheduled scan pointer access

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.

Cc: stable@vger.kernel.org [3.8+]
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index eeb71480f1af..d4397eba5408 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -254,10 +254,10 @@ 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;
-
         rtnl_lock();
 
+        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) {