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Fix last_scan_res update existing BSS entry is update

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The BSS pointer may change if the entry needs to be reallocated
and the new pointer has to be added to the last_scan_res array
to avoid using pointers to freed memory.

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2012-09-10 12:33:29 +02:00
parent e88f0901eb
commit 762b99db7a
1 changed files with 13 additions and 3 deletions
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16
wpa_supplicant/bss.c
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@ -391,8 +391,9 @@ static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
} }
static void wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss, static struct wpa_bss *
struct wpa_scan_res *res) wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
struct wpa_scan_res *res)
{ {
u32 changes; u32 changes;
@ -414,6 +415,13 @@ static void wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
nbss = os_realloc(bss, sizeof(*bss) + res->ie_len + nbss = os_realloc(bss, sizeof(*bss) + res->ie_len +
res->beacon_ie_len); res->beacon_ie_len);
if (nbss) { if (nbss) {
unsigned int i;
for (i = 0; i < wpa_s->last_scan_res_used; i++) {
if (wpa_s->last_scan_res[i] == bss) {
wpa_s->last_scan_res[i] = nbss;
break;
}
}
if (wpa_s->current_bss == bss) if (wpa_s->current_bss == bss)
wpa_s->current_bss = nbss; wpa_s->current_bss = nbss;
bss = nbss; bss = nbss;
@ -429,6 +437,8 @@ static void wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
dl_list_add_tail(&wpa_s->bss, &bss->list); dl_list_add_tail(&wpa_s->bss, &bss->list);
notify_bss_changes(wpa_s, changes, bss); notify_bss_changes(wpa_s, changes, bss);
return bss;
} }
@ -482,7 +492,7 @@ void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
if (bss == NULL) if (bss == NULL)
bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res); bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res);
else else
wpa_bss_update(wpa_s, bss, res); bss = wpa_bss_update(wpa_s, bss, res);
if (bss == NULL) if (bss == NULL)
return; return;