Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.7 09/20] qrtr: orphan socket in qrtr_release() | Date | Thu, 30 Jul 2020 10:03:59 +0200 |
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From: Cong Wang <xiyou.wangcong@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+6720d64f31c081c2f708@syzkaller.appspotmail.com Fixes: 28fb4e59a47d ("net: qrtr: Expose tunneling endpoint to user space") Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/qrtr/qrtr.c | 1 + 1 file changed, 1 insertion(+)
--- a/net/qrtr/qrtr.c +++ b/net/qrtr/qrtr.c @@ -1180,6 +1180,7 @@ 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))
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