4.9-stable review patch. If anyone has any objections, please let me know.
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From: Kirill Tkhai ktkhai@virtuozzo.com
[ 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 --- net/kcm/kcmsock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/kcm/kcmsock.c +++ b/net/kcm/kcmsock.c @@ -1671,7 +1671,7 @@ static struct file *kcm_clone(struct soc __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);