diff options
| author | Johannes Berg <johannes@sipsolutions.net> | 2009-07-25 11:58:36 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2009-07-29 21:45:58 +0200 |
| commit | 8d8b261a5c11bd043b9b0e0c7e6c49d57611e3ae (patch) | |
| tree | e8c7205506cb7f6545c19fdb683872661127ac90 /net/mac80211/mlme.c | |
| parent | cfg80211: fix circular lock dependency (1) (diff) | |
| download | linux-8d8b261a5c11bd043b9b0e0c7e6c49d57611e3ae.tar.xz linux-8d8b261a5c11bd043b9b0e0c7e6c49d57611e3ae.zip | |
mac80211: fix receiving deauth
Marcel reported a warning, which quite obviously comes
from an oversight in the code handling deauth frames,
and which resulted in multiple follow-up warnings due
to this missing handling. This patch adds the missing
deauth handling (telling cfg80211 about it) and also
removes the follow-up warnings since they could happen
due to races even if nothing is wrong. I've explained
the races in the comments.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Reported-by: Marcel Holtmann <marcel@holtmann.org>
Tested-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to '')
| -rw-r--r-- | net/mac80211/mlme.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 76c03daeb455..f60a83102ea2 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -2003,6 +2003,9 @@ static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, case RX_MGMT_CFG80211_ASSOC: cfg80211_send_rx_assoc(sdata->dev, (u8 *) mgmt, skb->len); break; + case RX_MGMT_CFG80211_DEAUTH: + cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len, NULL); + break; default: WARN(1, "unexpected: %d", rma); } @@ -2498,8 +2501,13 @@ int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata, } } - /* cfg80211 should catch this... */ - if (WARN_ON(!bssid)) { + /* + * cfg80211 should catch this ... but it's racy since + * we can receive a deauth frame, process it, hand it + * to cfg80211 while that's in a locked section already + * trying to tell us that the user wants to disconnect. + */ + if (!bssid) { mutex_unlock(&ifmgd->mtx); return -ENOLINK; } @@ -2524,8 +2532,13 @@ int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata, mutex_lock(&ifmgd->mtx); - /* cfg80211 should catch that */ - if (WARN_ON(&ifmgd->associated->cbss != req->bss)) { + /* + * cfg80211 should catch this ... but it's racy since + * we can receive a disassoc frame, process it, hand it + * to cfg80211 while that's in a locked section already + * trying to tell us that the user wants to disconnect. + */ + if (&ifmgd->associated->cbss != req->bss) { mutex_unlock(&ifmgd->mtx); return -ENOLINK; } |