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authorCong Wang <xiyou.wangcong@gmail.com>2018-12-16 23:25:12 -0800
committerDavid S. Miller <davem@davemloft.net>2018-12-18 15:44:23 -0800
commit3c6306d44082ef007a258ae1b86ea58e6974ee3f (patch)
tree817d7e2f340a57554677de33e228adfe5cc7cdad /net/tipc
parentqed: Fix an error code qed_ll2_start_xmit() (diff)
downloadlinux-dev-3c6306d44082ef007a258ae1b86ea58e6974ee3f.tar.xz
linux-dev-3c6306d44082ef007a258ae1b86ea58e6974ee3f.zip
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@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>
Diffstat (limited to 'net/tipc')
-rw-r--r--net/tipc/socket.c9
1 files 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);