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mac80211: fix NULL pointer dereference in ieee80211_compatible_rates 

Fix a possible NULL pointer dereference in ieee80211_compatible_rates
introduced in the patch "mac80211: fix association with some APs". If no bss
is available just use all supported rates in the association request.

Signed-off-by: Helmut Schaa <hschaa@suse.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Helmut Schaa 2008-05-20 09:56:37 +02:00 committed by John W. Linville
parent 51e779f0da
commit 0d580a774b
1 changed files with 11 additions and 4 deletions
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15
net/mac80211/mlme.c
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@ -730,7 +730,17 @@ static void ieee80211_send_assoc(struct net_device *dev,
if (bss->wmm_ie) {
wmm = 1;
}
/* get all rates supported by the device and the AP as
* some APs don't like getting a superset of their rates
* in the association request (e.g. D-Link DAP 1353 in
* b-only mode) */
rates_len = ieee80211_compatible_rates(bss, sband, &rates);
ieee80211_rx_bss_put(dev, bss);
} else {
rates = ~0;
rates_len = sband->n_bitrates;
}
mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
@ -761,10 +771,7 @@ static void ieee80211_send_assoc(struct net_device *dev,
*pos++ = ifsta->ssid_len;
memcpy(pos, ifsta->ssid, ifsta->ssid_len);
/* all supported rates should be added here but some APs
* (e.g. D-Link DAP 1353 in b-only mode) don't like that
* Therefore only add rates the AP supports */
rates_len = ieee80211_compatible_rates(bss, sband, &rates);
/* add all rates which were marked to be used above */
supp_rates_len = rates_len;
if (supp_rates_len > 8)
supp_rates_len = 8;