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mac80211: fix SSID copy on IBSS JOIN
The 'ssid' field of the cfg80211_ibss_params is a u8 pointer and its length is likely to be less than IEEE80211_MAX_SSID_LEN most of the time. This patch fixes the ssid copy in ieee80211_ibss_join() by using the SSID length to prevent it from reading beyond the string. Cc: stable@vger.kernel.org Signed-off-by: Antonio Quartulli <ordex@autistici.org> [rewrapped commit message, small rewording] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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@ -1108,7 +1108,7 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
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sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
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sdata->u.ibss.ibss_join_req = jiffies;
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memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN);
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memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
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sdata->u.ibss.ssid_len = params->ssid_len;
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mutex_unlock(&sdata->u.ibss.mtx);
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