kcm: Fix use-after-free caused by clonned sockets

[ Upstream commit eb7f54b90bd8f469834c5e86dcf72ebf9a629811 ]

(resend for properly queueing in patchwork)

kcm_clone() creates kernel socket, which does not take net counter.
Thus, the net may die before the socket is completely destructed,
i.e. kcm_exit_net() is executed before kcm_done().

Reported-by: syzbot+5f1a04e374a635efc426@syzkaller.appspotmail.com
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c
index cc306de..553d0ad 100644 (file)
--- a/net/kcm/kcmsock.c
+++ b/net/kcm/kcmsock.c
@@ -1671,7 +1671,7 @@ static struct file *kcm_clone(struct socket *osock)
        __module_get(newsock->ops->owner);
 
        newsk = sk_alloc(sock_net(osock->sk), PF_KCM, GFP_KERNEL,
-                        &kcm_proto, true);
+                        &kcm_proto, false);
        if (!newsk) {
                sock_release(newsock);
                return ERR_PTR(-ENOMEM);