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    Subject[PATCH 5.1 116/121] mac80211: drop robust management frames from unknown TA
    Date
    From: Johannes Berg <johannes.berg@intel.com>

    commit 588f7d39b3592a36fb7702ae3b8bdd9be4621e2f upstream.

    When receiving a robust management frame, drop it if we don't have
    rx->sta since then we don't have a security association and thus
    couldn't possibly validate the frame.

    Cc: stable@vger.kernel.org
    Signed-off-by: Johannes Berg <johannes.berg@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    net/mac80211/rx.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/net/mac80211/rx.c
    +++ b/net/mac80211/rx.c
    @@ -3823,6 +3823,8 @@ static bool ieee80211_accept_frame(struc
    case NL80211_IFTYPE_STATION:
    if (!bssid && !sdata->u.mgd.use_4addr)
    return false;
    + if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta)
    + return false;
    if (multicast)
    return true;
    return ether_addr_equal(sdata->vif.addr, hdr->addr1);

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