tree 893f433859d2eb03618ec93b1cc7ff976c20db57
parent e1b0c311b790dc5a89188014f915e6ad06e2e076
author Xin Long <lucien.xin@gmail.com> 1560677047 +0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1561184114 +0200

tipc: purge deferredq list for each grp member in tipc_group_delete

[ Upstream commit 5cf02612b33f104fe1015b2dfaf1758ad3675588 ]

Syzbot reported a memleak caused by grp members' deferredq list not
purged when the grp is be deleted.

The issue occurs when more(msg_grp_bc_seqno(hdr), m->bc_rcv_nxt) in
tipc_group_filter_msg() and the skb will stay in deferredq.

So fix it by calling __skb_queue_purge for each member's deferredq
in tipc_group_delete() when a tipc sk leaves the grp.

Fixes: b87a5ea31c93 ("tipc: guarantee group unicast doesn't bypass group broadcast")
Reported-by: syzbot+78fbe679c8ca8d264a8d@syzkaller.appspotmail.com
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>