diff options
| author | Dedy Lansky <dlansky@codeaurora.org> | 2018-06-15 14:05:01 +0300 |
|---|---|---|
| committer | Johannes Berg <johannes@sipsolutions.net> | 2018-06-15 14:05:14 +0300 |
| commit | bf2b61a6838f19cbc33f6732715012c483fa3795 (patch) | |
| tree | 91aea74e94706907adfdf0c8be7daca9c6f86259 | |
| parent | dc8b274f0952f604d72b10698cde6887321a669f (diff) | |
| download | linux-bf2b61a6838f19cbc33f6732715012c483fa3795.tar.xz | |
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: Dedy Lansky <dlansky@codeaurora.org>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
| -rw-r--r-- | net/wireless/core.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/wireless/core.c b/net/wireless/core.c index 5fe35aafdd9c..48e8097339ab 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -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) { |