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

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(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>
This commit is contained in:
Kirill Tkhai 2018-06-01 14:30:38 +03:00 committed by David S. Miller
parent 664088f8d6
commit eb7f54b90b
1 changed files with 1 additions and 1 deletions
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2
net/kcm/kcmsock.c
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@ -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);