From: Cong Wang <xiyou.wangc...@gmail.com>
[ Upstream commit af9f691f0f5bdd1ade65a7b84927639882d7c3e5 ]
We have to detach sock from socket in qrtr_release(),
otherwise skb->sk may still reference to this socket
when the skb is released in tun->queue, particularly
sk->sk_wq still points to &sock->wq, which leads to
a UAF.
Reported-and-tested-by: syzbot+6720d64f31c081c2f...@syzkaller.appspotmail.com
Fixes: 28fb4e59a47d ("net: qrtr: Expose tunneling endpoint to user space")
Cc: Bjorn Andersson <bjorn.anders...@linaro.org>
Cc: Eric Dumazet <eric.duma...@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com>
Reviewed-by: Eric Dumazet <eduma...@google.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
net/qrtr/qrtr.c | 1 +
1 file changed, 1 insertion(+)
--- a/net/qrtr/qrtr.c
+++ b/net/qrtr/qrtr.c
@@ -1004,6 +1004,7 @@ static int qrtr_release(struct socket *s
sk->sk_state_change(sk);
sock_set_flag(sk, SOCK_DEAD);
+ sock_orphan(sk);
sock->sk = NULL;
if (!sock_flag(sk, SOCK_ZAPPED))
