mac80211: Fix NULL-pointer deference on ibss merge when not ready
authorTim Harvey <harvey.tim@gmail.com>
Thu, 9 Dec 2010 18:43:13 +0000 (10:43 -0800)
committerJohn W. Linville <linville@tuxdriver.com>
Mon, 13 Dec 2010 19:53:46 +0000 (14:53 -0500)
dev_open will eventually call ieee80211_ibss_join which sets up the
skb used for beacons/probe-responses however it is possible to
receive beacons that attempt to merge before this occurs causing
a null pointer dereference.  Check ssid_len as that is the last
thing set in ieee80211_ibss_join.

This occurs quite easily in the presence of adhoc nodes with hidden SSID's

revised previous patch to check further up based on irc feedback

Signed-off-by: Tim Harvey <harvey.tim@gmail.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
net/mac80211/ibss.c

index 239c4836a946601f27c69f965ae1a0935e71b434..077a93dd1671a841b9db85fe4cf6981aa90c1edf 100644 (file)
@@ -780,6 +780,9 @@ void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 
        mutex_lock(&sdata->u.ibss.mtx);
 
+       if (!sdata->u.ibss.ssid_len)
+               goto mgmt_out; /* not ready to merge yet */
+
        switch (fc & IEEE80211_FCTL_STYPE) {
        case IEEE80211_STYPE_PROBE_REQ:
                ieee80211_rx_mgmt_probe_req(sdata, mgmt, skb->len);
@@ -797,6 +800,7 @@ void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
                break;
        }
 
+ mgmt_out:
        mutex_unlock(&sdata->u.ibss.mtx);
 }