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cfg80211: fix rcu in cfg80211_unregister_wdev

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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: Dedy Lansky <dlansky@codeaurora.org>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
This commit is contained in:
Dedy Lansky 2018-06-15 13:05:01 +02:00 committed by Johannes Berg
parent dc8b274f09
commit bf2b61a683
1 changed files with 1 additions and 0 deletions
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net/wireless/core.c
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@ -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) {