Commit 72788b85 authored by Xin Long's avatar Xin Long Committed by Greg Kroah-Hartman

tipc: purge deferredq list for each grp member in tipc_group_delete

[ Upstream commit 5cf02612 ]

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: b87a5ea3 ("tipc: guarantee group unicast doesn't bypass group broadcast")
Reported-by: syzbot+78fbe679c8ca8d264a8d@syzkaller.appspotmail.com
Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Acked-by: default avatarYing Xue <ying.xue@windriver.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent aecf98cd
...@@ -218,6 +218,7 @@ void tipc_group_delete(struct net *net, struct tipc_group *grp) ...@@ -218,6 +218,7 @@ void tipc_group_delete(struct net *net, struct tipc_group *grp)
rbtree_postorder_for_each_entry_safe(m, tmp, tree, tree_node) { rbtree_postorder_for_each_entry_safe(m, tmp, tree, tree_node) {
tipc_group_proto_xmit(grp, m, GRP_LEAVE_MSG, &xmitq); tipc_group_proto_xmit(grp, m, GRP_LEAVE_MSG, &xmitq);
__skb_queue_purge(&m->deferredq);
list_del(&m->list); list_del(&m->list);
kfree(m); kfree(m);
} }
......
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