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    Subject[PATCH AUTOSEL 4.20 70/77] mac80211: don't initiate TDLS connection if station is not associated to AP
    Date
    From: Balaji Pothunoori <bpothuno@codeaurora.org>

    [ Upstream commit 7ed5285396c257fd4070b1e29e7b2341aae2a1ce ]

    Following call trace is observed while adding TDLS peer entry in driver
    during TDLS setup.

    Call Trace:
    [<c1301476>] dump_stack+0x47/0x61
    [<c10537d2>] __warn+0xe2/0x100
    [<fa22415f>] ? sta_apply_parameters+0x49f/0x550 [mac80211]
    [<c1053895>] warn_slowpath_null+0x25/0x30
    [<fa22415f>] sta_apply_parameters+0x49f/0x550 [mac80211]
    [<fa20ad42>] ? sta_info_alloc+0x1c2/0x450 [mac80211]
    [<fa224623>] ieee80211_add_station+0xe3/0x160 [mac80211]
    [<c1876fe3>] nl80211_new_station+0x273/0x420
    [<c170f6d9>] genl_rcv_msg+0x219/0x3c0
    [<c170f4c0>] ? genl_rcv+0x30/0x30
    [<c170ee7e>] netlink_rcv_skb+0x8e/0xb0
    [<c170f4ac>] genl_rcv+0x1c/0x30
    [<c170e8aa>] netlink_unicast+0x13a/0x1d0
    [<c170ec18>] netlink_sendmsg+0x2d8/0x390
    [<c16c5acd>] sock_sendmsg+0x2d/0x40
    [<c16c6369>] ___sys_sendmsg+0x1d9/0x1e0

    Fixing this by allowing TDLS setup request only when we have completed
    association.

    Signed-off-by: Balaji Pothunoori <bpothuno@codeaurora.org>
    Signed-off-by: Johannes Berg <johannes.berg@intel.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    net/mac80211/cfg.c | 4 ++++
    1 file changed, 4 insertions(+)

    diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
    index 818aa0060349..04337e6be7f0 100644
    --- a/net/mac80211/cfg.c
    +++ b/net/mac80211/cfg.c
    @@ -1490,6 +1490,10 @@ static int ieee80211_add_station(struct wiphy *wiphy, struct net_device *dev,
    if (params->sta_flags_set & BIT(NL80211_STA_FLAG_TDLS_PEER))
    sta->sta.tdls = true;

    + if (sta->sta.tdls && sdata->vif.type == NL80211_IFTYPE_STATION &&
    + !sdata->u.mgd.associated)
    + return -EINVAL;
    +
    err = sta_apply_parameters(local, sta, params);
    if (err) {
    sta_info_free(local, sta);
    --
    2.19.1
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