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scan: Update current request on NL80211_CMD_SCAN_ABORTED

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If the current request is not freed when we receive the
NL80211_CMD_SCAN_ABORTED event, device.c will keep thinking that
we're still scanning and the scan.c logic also gets confused and may
resend the current request at some point and call sr->trigger again
causing a segfault in device.c.

I pass an empty bss_list to the callback, another possibility would be
to pass NULL to let the callback know not to replace old results yet.
The callbacks would need to handle a NULL first.
This commit is contained in:
Andrew Zaborowski 2017-03-13 16:30:46 +01:00 committed by Denis Kenzior
parent b2642d42bf
commit ba5d5430e1
1 changed files with 29 additions and 0 deletions
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29
src/scan.c
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@ -1150,9 +1150,38 @@ static void scan_notify(struct l_genl_msg *msg, void *user_data)
break;
case NL80211_CMD_SCAN_ABORTED:
{
struct scan_request *sr = l_queue_peek_head(sc->requests);
if (!sr || !sr->triggered) {
sc->state = SCAN_STATE_NOT_RUNNING;
break;
}
if (sr->callback) {
bool new_owner;
struct l_queue *bss_list = l_queue_new();
new_owner = sr->callback(attr_wiphy, attr_ifindex,
bss_list, sr->userdata);
if (!new_owner)
l_queue_destroy(bss_list, NULL);
}
if (sr->destroy)
sr->destroy(sr->userdata);
scan_request_free(sr);
l_queue_pop_head(sc->requests);
sc->state = SCAN_STATE_NOT_RUNNING;
if (!start_next_scan_request(sc) && sc->sp.rearm)
scan_periodic_rearm(sc);
break;
}
}
}
uint8_t scan_freq_to_channel(uint32_t freq, enum scan_band *out_band)