This patch corrects the problem where non-privileged user may create
netlink socket with port_id equal to port_id used by hostapd to create
virtual wireless network interfaces. Call to bind() will fail for such
socket, but release notification sent on close() or process termination
to nl80211 subsystem will destroy virtual network interfaces while
hostapd is still running.
Signed-off-by: Dmitry Ivanov <dima@xxxxxxxx>
---
net/netlink/af_netlink.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 215fc08..330ebd6 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -688,7 +688,7 @@ static int netlink_release(struct socket *sock)
skb_queue_purge(&sk->sk_write_queue);
- if (nlk->portid) {
+ if (nlk->portid && nlk->bound) {
struct netlink_notify n = {
.net = sock_net(sk),
.protocol = sk->sk_protocol,
--
2.1.4
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