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mac80211: fix SSID copy on IBSS JOIN

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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>
This commit is contained in:
Antonio Quartulli 2012-10-26 18:54:25 +02:00 committed by Johannes Berg
parent f7fbf70ee9
commit badecb001a
1 changed files with 1 additions and 1 deletions
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2
net/mac80211/ibss.c
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@ -1108,7 +1108,7 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH;
sdata->u.ibss.ibss_join_req = jiffies; sdata->u.ibss.ibss_join_req = jiffies;
memcpy(sdata->u.ibss.ssid, params->ssid, IEEE80211_MAX_SSID_LEN); memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len);
sdata->u.ibss.ssid_len = params->ssid_len; sdata->u.ibss.ssid_len = params->ssid_len;
mutex_unlock(&sdata->u.ibss.mtx); mutex_unlock(&sdata->u.ibss.mtx);