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Commit bf2b61a6 authored by Dedy Lansky's avatar Dedy Lansky Committed by Johannes Berg
Browse files

cfg80211: fix rcu in cfg80211_unregister_wdev 



Callers of cfg80211_unregister_wdev can free the wdev object
immediately after this function returns. This may crash the kernel
because this wdev object is still in use by other threads.
Add synchronize_rcu() after list_del_rcu to make sure wdev object can
be safely freed.

Signed-off-by: default avatarDedy Lansky <dlansky@codeaurora.org>
Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
parent dc8b274f

net/wireless/core.c

+1 −0
Original line number Diff line number Diff line
@@ -1012,6 +1012,7 @@ void cfg80211_unregister_wdev(struct wireless_dev *wdev) 
	nl80211_notify_iface(rdev, wdev, NL80211_CMD_DEL_INTERFACE);



	list_del_rcu(&wdev->list);

	synchronize_rcu();

	rdev->devlist_generation++;



	switch (wdev->iftype) {