[PATCH 5.19 21/33] wifi: cfg80211/mac80211: reject bad MBSSID elements

Greg Kroah-Hartman
2022-10-13T18:06:08Z

From: Johannes Berg <johannes.berg@intel.com>

commit 8f033d2becc24aa6bfd2a5c104407963560caabc upstream.

Per spec, the maximum value for the MaxBSSID ('n') indicator is 8,
and the minimum is 1 since a multiple BSSID set with just one BSSID
doesn't make sense (the # of BSSIDs is limited by 2^n).

Limit this in the parsing in both cfg80211 and mac80211, rejecting
any elements with an invalid value.

This fixes potentially bad shifts in the processing of these inside
the cfg80211_gen_new_bssid() function later.

I found this during the investigation of CVE-2022-41674 fixed by the
previous patch.

Fixes: 0b8fb8235be8 ("cfg80211: Parsing of Multiple BSSID information in scanning")
Fixes: 78ac51f81532 ("mac80211: support multi-bssid")
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/mac80211/util.c | 2 ++
net/wireless/scan.c | 2 ++
2 files changed, 4 insertions(+)

--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1439,6 +1439,8 @@ static size_t ieee802_11_find_bssid_prof
for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, start, len) {
if (elem->datalen < 2)
continue;
+ if (elem->data[0] < 1 || elem->data[0] > 8)
+ continue;

for_each_element(sub, elem->data + 1, elem->datalen - 1) {
u8 new_bssid[ETH_ALEN];
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -2143,6 +2143,8 @@ static void cfg80211_parse_mbssid_data(s
for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
if (elem->datalen < 4)
continue;
+ if (elem->data[0] < 1 || (int)elem->data[0] > 8)
+ continue;
for_each_element(sub, elem->data + 1, elem->datalen - 1) {
u8 profile_len;