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    Subject[PATCH 4.4 89/99] cfg80211: Purge frame registrations on iftype change
    Date
    From: Denis Kenzior <denkenz@gmail.com>

    commit c1d3ad84eae35414b6b334790048406bd6301b12 upstream.

    Currently frame registrations are not purged, even when changing the
    interface type. This can lead to potentially weird situations where
    frames possibly not allowed on a given interface type remain registered
    due to the type switching happening after registration.

    The kernel currently relies on userspace apps to actually purge the
    registrations themselves, this is not something that the kernel should
    rely on.

    Add a call to cfg80211_mlme_purge_registrations() to forcefully remove
    any registrations left over prior to switching the iftype.

    Cc: stable@vger.kernel.org
    Signed-off-by: Denis Kenzior <denkenz@gmail.com>
    Link: https://lore.kernel.org/r/20190828211110.15005-1-denkenz@gmail.com
    Signed-off-by: Johannes Berg <johannes.berg@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    net/wireless/util.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/net/wireless/util.c
    +++ b/net/wireless/util.c
    @@ -974,6 +974,7 @@ int cfg80211_change_iface(struct cfg8021
    }

    cfg80211_process_rdev_events(rdev);
    + cfg80211_mlme_purge_registrations(dev->ieee80211_ptr);
    }

    err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);

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