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由 andrea merello 提交于
When IEEE80211_HW_SIGNAL_UNSPEC is set, mac80211 will perform a division by max_signal in ieee80211_bss_info_update. If max_signal is not properly set by the driver (for example it is zero) this leads to a divide error and crash. Thanks to Larry Finger, who pointed me to this. This patch adds in ieee80211_register_hw one more check to detect this condition and eventually returns -EINVAL, as already done for other checks already performed there. Signed-off-by: Nandrea merello <andrea.merello@gmail.com> [move to an already existing SIGNAL_UNSPEC check] Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
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