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| author | Kirill Tkhai <ktkhai@virtuozzo.com> | 2018-06-01 14:30:38 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-06-01 10:28:07 -0400 |
| commit | eb7f54b90bd8f469834c5e86dcf72ebf9a629811 (patch) | |
| tree | 508a9eb07e8d0720ac07f5f36b534de880a15769 | |
| parent | 664088f8d68178809b848ca450f2797efb34e8e7 (diff) | |
| download | linux-eb7f54b90bd8f469834c5e86dcf72ebf9a629811.tar.gz linux-eb7f54b90bd8f469834c5e86dcf72ebf9a629811.tar.bz2 linux-eb7f54b90bd8f469834c5e86dcf72ebf9a629811.zip | |
kcm: Fix use-after-free caused by clonned sockets
(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>
| -rw-r--r-- | net/kcm/kcmsock.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/kcm/kcmsock.c b/net/kcm/kcmsock.c index dc76bc346829..d3601d421571 100644 --- 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); |