wireless, wl1251: Fix potential NULL pointer dereference in wl1251_op_bss_info_changed()

In drivers/net/wireless/wl12xx/wl1251_main.c:wl1251_op_bss_info_changed() we make
a call to ieee80211_beacon_get() which may return NULL, but we do not
check the return value before dereferencing the pointer.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/wl12xx/wl1251_main.c b/drivers/net/wireless/wl12xx/wl1251_main.c
index 049f6c8..093bda2 100644 (file)
--- a/drivers/net/wireless/wl12xx/wl1251_main.c
+++ b/drivers/net/wireless/wl12xx/wl1251_main.c
@@ -1040,6 +1040,9 @@ static void wl1251_op_bss_info_changed(struct ieee80211_hw *hw,
 
        if (changed & BSS_CHANGED_BEACON) {
                beacon = ieee80211_beacon_get(hw, vif);
+               if (!beacon)
+                       goto out_sleep;
+
                ret = wl1251_cmd_template_set(wl, CMD_BEACON, beacon->data,
                                              beacon->len);