[PATCH 4/4] hostapd: Clean up if interface setup fails

[Michal Kazior]

If for some reason interface setup fails mid-way when setting up
multi-BSS AP it was possible to get segmentation fault because driver
was not properly cleaned up.

One possible trigger when using nl80211 driver was udev renaming an
interface created by hostapd causing, e.g. linux_set_iface_flags() to
fail.

Signed-off-by: Michal Kazior <michal.kazior at tieto.com>
---
 src/ap/hostapd.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/ap/hostapd.c b/src/ap/hostapd.c
index d6f937c..d5c83e5 100644
--- a/src/ap/hostapd.c
+++ b/src/ap/hostapd.c
@@ -1229,8 +1229,16 @@ int hostapd_setup_interface_complete(struct hostapd_iface *iface, int err)
 		hapd = iface->bss[j];
 		if (j)
 			os_memcpy(hapd->own_addr, prev_addr, ETH_ALEN);
-		if (hostapd_setup_bss(hapd, j == 0))
+		if (hostapd_setup_bss(hapd, j == 0)) {
+			do {
+				hapd = iface->bss[j];
+				hostapd_free_stas(hapd);
+				hostapd_flush_old_stations(hapd, WLAN_REASON_DEAUTH_LEAVING);
+				hostapd_clear_wep(hapd);
+				hostapd_free_hapd_data(hapd);
+			} while (j-- > 0);
 			goto fail;
+		}
 		if (hostapd_mac_comp_empty(hapd->conf->bssid) == 0)
 			prev_addr = hapd->own_addr;
 	}
-- 
1.8.5.3