netdev - RE: [Patch net] tipc: check group dests after tipc_wait_for

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Date:   Mon, 17 Dec 2018 11:40:15 +0000
From:   Jon Maloy <jon.maloy@...csson.com>
To:     Cong Wang <xiyou.wangcong@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     Ying Xue <ying.xue@...driver.com>
Subject: RE: [Patch net] tipc: check group dests after tipc_wait_for_cond()

Acked-by: Jon Maloy <jon.maloy@...csson.com>

Thank you, Cong.

///jon

> -----Original Message-----
> From: Cong Wang <xiyou.wangcong@...il.com>
> Sent: 17-Dec-18 02:25
> To: netdev@...r.kernel.org
> Cc: Cong Wang <xiyou.wangcong@...il.com>; Ying Xue
> <ying.xue@...driver.com>; Jon Maloy <jon.maloy@...csson.com>
> Subject: [Patch net] tipc: check group dests after tipc_wait_for_cond()
> 
> Similar to commit 143ece654f9f ("tipc: check tsk->group in
> tipc_wait_for_cond()") we have to reload grp->dests too after we re-take
> the sock lock.
> This means we need to move the dsts check after tipc_wait_for_cond() too.
> 
> Fixes: 75da2163dbb6 ("tipc: introduce communication groups")
> Reported-and-tested-by:
> syzbot+99f20222fc5018d2b97a@...kaller.appspotmail.com
> Cc: Ying Xue <ying.xue@...driver.com>
> Cc: Jon Maloy <jon.maloy@...csson.com>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
> ---
>  net/tipc/socket.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/net/tipc/socket.c b/net/tipc/socket.c index
> 656940692a44..8f34db2a9785 100644
> --- a/net/tipc/socket.c
> +++ b/net/tipc/socket.c
> @@ -1009,7 +1009,7 @@ static int tipc_send_group_bcast(struct socket
> *sock, struct msghdr *m,
>  	struct sock *sk = sock->sk;
>  	struct net *net = sock_net(sk);
>  	struct tipc_sock *tsk = tipc_sk(sk);
> -	struct tipc_nlist *dsts = tipc_group_dests(tsk->group);
> +	struct tipc_nlist *dsts;
>  	struct tipc_mc_method *method = &tsk->mc_method;
>  	bool ack = method->mandatory && method->rcast;
>  	int blks = tsk_blocks(MCAST_H_SIZE + dlen); @@ -1018,9 +1018,6
> @@ static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
>  	struct sk_buff_head pkts;
>  	int rc = -EHOSTUNREACH;
> 
> -	if (!dsts->local && !dsts->remote)
> -		return -EHOSTUNREACH;
> -
>  	/* Block or return if any destination link or member is congested */
>  	rc = tipc_wait_for_cond(sock, &timeout,
>  				!tsk->cong_link_cnt && tsk->group && @@ -
> 1028,6 +1025,10 @@ static int tipc_send_group_bcast(struct socket *sock,
> struct msghdr *m,
>  	if (unlikely(rc))
>  		return rc;
> 
> +	dsts = tipc_group_dests(tsk->group);
> +	if (!dsts->local && !dsts->remote)
> +		return -EHOSTUNREACH;
> +
>  	/* Complete message header */
>  	if (dest) {
>  		msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
> --
> 2.19.2