[PATCH 3.14 42/83] mac80211: fix potential use-after-free

Greg Kroah-Hartman
2014-05-11T19:23:07Z

From: Johannes Berg <johannes.berg@intel.com>

commit d2722f8b87fb172ff2f31d3a2816b31d58678d40 upstream.

The bss struct might be freed in ieee80211_rx_bss_put(),
so we shouldn't use it afterwards.

Fixes: 817cee7675237 ("mac80211: track AP's beacon rate and give it to the driver")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
net/mac80211/mlme.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -2708,8 +2708,8 @@ static void ieee80211_rx_bss_info(struct
bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
channel);
if (bss) {
- ieee80211_rx_bss_put(local, bss);
sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
+ ieee80211_rx_bss_put(local, bss);
}
}