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WNM: Fix neighbor report subelement parser

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Only the Neighbor Report element should be included here, so verify that
the element id matches. In addition, verify that each subelement has
valid length before using the data.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2014-04-08 00:53:55 +03:00 committed by Jouni Malinen
parent 5583b8d1eb
commit 1aa6f953bb
2 changed files with 15 additions and 5 deletions
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1
src/common/ieee802_11_defs.h
View file

@ -224,6 +224,7 @@
#define WLAN_EID_QOS 46
#define WLAN_EID_RSN 48
#define WLAN_EID_EXT_SUPP_RATES 50
#define WLAN_EID_NEIGHBOR_REPORT 52
#define WLAN_EID_MOBILITY_DOMAIN 54
#define WLAN_EID_FAST_BSS_TRANSITION 55
#define WLAN_EID_TIMEOUT_INTERVAL 56

19
wpa_supplicant/wnm_sta.c
View file

@ -461,8 +461,15 @@ static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s,
id = *pos++;
elen = *pos++;
wpa_printf(MSG_DEBUG, "WNM: Subelement id=%u len=%u", id, elen);
left -= 2;
if (elen > left) {
wpa_printf(MSG_DEBUG,
"WNM: Truncated neighbor report subelement");
break;
}
wnm_parse_neighbor_report_elem(rep, id, elen, pos);
left -= 2 + elen;
left -= elen;
pos += elen;
}
}
@ -695,10 +702,12 @@ static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
wpa_printf(MSG_DEBUG, "WNM: Truncated request");
return;
}
wnm_parse_neighbor_report(
wpa_s, pos, len,
&wpa_s->wnm_neighbor_report_elements[
wpa_s->wnm_num_neighbor_report]);
if (tag == WLAN_EID_NEIGHBOR_REPORT) {
struct neighbor_report *rep;
rep = &wpa_s->wnm_neighbor_report_elements[
wpa_s->wnm_num_neighbor_report];
wnm_parse_neighbor_report(wpa_s, pos, len, rep);
}
pos += len;
wpa_s->wnm_num_neighbor_report++;