jeltz/hostap
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

PMKSA: Do not evict active cache entry when adding new ones

Browse source 
If the PMKSA cache is full (i.e., 32 candidates have been seen in scan
results and have not yet expired) then any additional entries can
potentially evict the current/active entry (if it is the oldest entry),
which triggers a pointless local deauthentication. The supplicant
shouldn't replace the current/active entry if it is still valid, but
instead the oldest entry that is *not* the current/active one.

Signed-hostap: Dan Williams <dcbw@redhat.com>
intended-for: hostap-1
This commit is contained in:
Dan Williams 2012-08-10 17:55:17 +03:00 committed by Jouni Malinen
parent 473b6f22e9
commit 0e502f97c5
1 changed files with 19 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
src/rsn_supp/pmksa_cache.c
View file

@ -197,12 +197,26 @@ pmksa_cache_add(struct rsn_pmksa_cache *pmksa, const u8 *pmk, size_t pmk_len,
if (pmksa->pmksa_count >= pmksa_cache_max_entries && pmksa->pmksa) {
/* Remove the oldest entry to make room for the new entry */
pos = pmksa->pmksa;
if (pos == pmksa->sm->cur_pmksa) {
/*
* Never remove the current PMKSA cache entry, since
* it's in use, and removing it triggers a needless
* deauthentication.
*/
pos = pos->next;
pmksa->pmksa->next = pos ? pos->next : NULL;
} else
pmksa->pmksa = pos->next;
wpa_printf(MSG_DEBUG, "RSN: removed the oldest PMKSA cache "
"entry (for " MACSTR ") to make room for new one",
if (pos) {
wpa_printf(MSG_DEBUG, "RSN: removed the oldest idle "
"PMKSA cache entry (for " MACSTR ") to "
"make room for new one",
MAC2STR(pos->aa));
pmksa_cache_free_entry(pmksa, pos, 0);
}
}
/* Add the new entry; order by expiration time */
pos = pmksa->pmksa;