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DPP3: Fix potential use-after-free on push button bootstrap info

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When removing the bootstrap info for the PB context, all the possible
pointers to that information needs to be cleared to avoid accesses to
freed memory.

Fixes: 37bccfcab8 ("DPP3: Push button bootstrap mechanism")
Signed-off-by: Jouni Malinen <quic_jouni@quicinc.com>
This commit is contained in:
Jouni Malinen 2024-01-22 12:41:02 +02:00 committed by Jouni Malinen
parent e3d6fce848
commit 9456adeeba
3 changed files with 17 additions and 0 deletions
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1
hostapd/ctrl_iface.c
View file

@ -4542,6 +4542,7 @@ static void hostapd_ctrl_iface_flush(struct hapd_interfaces *interfaces)
#ifdef CONFIG_DPP
dpp_global_clear(interfaces->dpp);
#ifdef CONFIG_DPP3
interfaces->dpp_pb_bi = NULL;
{
int i;

14
src/ap/dpp_hostapd.c
View file

@ -3955,11 +3955,25 @@ void hostapd_dpp_push_button_stop(struct hostapd_data *hapd)
ifaces->dpp_pb_time.usec = 0;
dpp_pkex_free(hapd->dpp_pkex);
hapd->dpp_pkex = NULL;
hapd->dpp_pkex_bi = NULL;
os_free(hapd->dpp_pkex_auth_cmd);
hapd->dpp_pkex_auth_cmd = NULL;
if (ifaces->dpp_pb_bi) {
char id[20];
size_t i;
for (i = 0; i < ifaces->count; i++) {
struct hostapd_iface *iface = ifaces->iface[i];
size_t j;
for (j = 0; iface && j < iface->num_bss; j++) {
struct hostapd_data *h = iface->bss[j];
if (h->dpp_pkex_bi == ifaces->dpp_pb_bi)
h->dpp_pkex_bi = NULL;
}
}
os_snprintf(id, sizeof(id), "%u", ifaces->dpp_pb_bi->id);
dpp_bootstrap_remove(ifaces->dpp, id);

2
wpa_supplicant/dpp_supplicant.c
View file

@ -5665,6 +5665,8 @@ void wpas_dpp_push_button_stop(struct wpa_supplicant *wpa_s)
if (wpa_s->dpp_pb_bi) {
char id[20];
if (wpa_s->dpp_pb_bi == wpa_s->dpp_pkex_bi)
wpa_s->dpp_pkex_bi = NULL;
os_snprintf(id, sizeof(id), "%u", wpa_s->dpp_pb_bi->id);
dpp_bootstrap_remove(wpa_s->dpp, id);
wpa_s->dpp_pb_bi = NULL;