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@xxxxxxxxxxxxxxxx>
Reported-by: Marcel Holtmann <marcel@xxxxxxxxxxxx>
---
net/mac80211/mlme.c | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
--- wireless-testing.orig/net/mac80211/mlme.c 2009-07-25 11:03:12.000000000 +0200
+++ wireless-testing/net/mac80211/mlme.c 2009-07-25 11:55:35.000000000 +0200
@@ -2003,6 +2003,9 @@ static void ieee80211_sta_rx_queued_mgmt
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 ieee8021
}
}
- /* 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 ieee80
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;
}
--
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