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tipc: check group dests after tipc_wait_for_cond()

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Similar to commit 143ece654f ("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: 75da2163db ("tipc: introduce communication groups")
Reported-and-tested-by: syzbot+99f20222fc5018d2b97a@syzkaller.appspotmail.com
Cc: Ying Xue <ying.xue@windriver.com>
Cc: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2018-12-16 23:25:12 -08:00 committed by David S. Miller
parent f07d427689
commit 3c6306d440
1 changed files with 5 additions and 4 deletions
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9
net/tipc/socket.c
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@ -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);