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Ignore too long SSID element value in parser

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The SSID element is defined to have a valid length range of 0-32. While
this length was supposed to validated by the users of the element
parser, there are not really any valid cases where the maximum length of
32 octet SSID would be exceeded and as such, the parser itself can
enforce the limit as an additional protection.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2015-04-07 11:50:10 +03:00 committed by Jouni Malinen
parent 9ed4eee345
commit 05e46a944a
2 changed files with 8 additions and 0 deletions
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6
src/common/ieee802_11_common.c
View File

@ -196,6 +196,12 @@ ParseRes ieee802_11_parse_elems(const u8 *start, size_t len,
switch (id) {
case WLAN_EID_SSID:
if (elen > SSID_MAX_LEN) {
wpa_printf(MSG_DEBUG,
"Ignored too long SSID element (elen=%u)",
elen);
break;
}
elems->ssid = pos;
elems->ssid_len = elen;
break;

2
src/common/ieee802_11_defs.h
View File

@ -1354,4 +1354,6 @@ struct rrm_link_measurement_report {
u8 variable[0];
} STRUCT_PACKED;
#define SSID_MAX_LEN 32
#endif /* IEEE802_11_DEFS_H */