[12/53] mac80211: fix bug in ieee80211_build_probe_req

[Greg KH]

3.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johannes Berg <johannes.berg@xxxxxxxxx>

commit 5b2bbf75a24d6b06afff6de0eb4819413fd81971 upstream.

ieee80211_probereq_get() can return NULL in
which case we should clean up & return NULL
in ieee80211_build_probe_req() as well.

Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 net/mac80211/util.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1055,6 +1055,8 @@ struct sk_buff *ieee80211_build_probe_re
 	skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
 				     ssid, ssid_len,
 				     buf, buf_len);
+	if (!skb)
+		goto out;
 
 	if (dst) {
 		mgmt = (struct ieee80211_mgmt *) skb->data;
@@ -1063,6 +1065,8 @@ struct sk_buff *ieee80211_build_probe_re
 	}
 
 	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
+
+ out:
 	kfree(buf);
 
 	return skb;


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