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WPS UPnP: Check os_get_random() result

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This makes the implementation more consistent (CID 72705).

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2014-10-11 18:58:17 +03:00
parent 533d7fb7b7
commit 92b5b371b6
1 changed files with 9 additions and 3 deletions
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12
src/wps/wps_upnp.c
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@ -251,13 +251,16 @@ void format_date(struct wpabuf *buf)
* use for constructing UUIDs for subscriptions. Presumably any method from
* rfc4122 is good enough; I've chosen random number method.
*/
static void uuid_make(u8 uuid[UUID_LEN])
static int uuid_make(u8 uuid[UUID_LEN])
{
os_get_random(uuid, UUID_LEN);
if (os_get_random(uuid, UUID_LEN) < 0)
return -1;
/* Replace certain bits as specified in rfc4122 or X.667 */
uuid[6] &= 0x0f; uuid[6] |= (4 << 4); /* version 4 == random gen */
uuid[8] &= 0x3f; uuid[8] |= 0x80;
return 0;
}
@ -716,7 +719,10 @@ struct subscription * subscription_start(struct upnp_wps_device_sm *sm,
s->sm = sm;
s->timeout_time = expire;
uuid_make(s->uuid);
if (uuid_make(s->uuid) < 0) {
subscription_destroy(s);
return NULL;
}
subscr_addr_list_create(s, callback_urls);
if (dl_list_empty(&s->addr_list)) {
wpa_printf(MSG_DEBUG, "WPS UPnP: No valid callback URLs in "