In both trigger_scan and sched_scan operations, we were checking for the SSID length before assigning the value correctly. Since the memory was just kzalloc'ed, the check was always failing and SSID with over 32 characters were allowed to go through. This was causing a buffer overflow when copying the actual SSID to the proper place. This bug has been there since 2.6.29-rc4. Backported from commit 208c72f4fe44fe09577e7975ba0e7fa0278f3d03. Cc: stable@xxxxxxxxxx Signed-off-by: Luciano Coelho <coelho@xxxxxx> Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx> --- net/wireless/nl80211.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 2c70a1e..29a1ce1 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -3239,12 +3239,12 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info) i = 0; if (info->attrs[NL80211_ATTR_SCAN_SSIDS]) { nla_for_each_nested(attr, info->attrs[NL80211_ATTR_SCAN_SSIDS], tmp) { + request->ssids[i].ssid_len = nla_len(attr); if (request->ssids[i].ssid_len > IEEE80211_MAX_SSID_LEN) { err = -EINVAL; goto out_free; } memcpy(request->ssids[i].ssid, nla_data(attr), nla_len(attr)); - request->ssids[i].ssid_len = nla_len(attr); i++; } } -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html