linux-kernel - Re: memory leak in tipc_buf

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Date:   Sun, 16 Jun 2019 15:02:05 +0800
From:   Ying Xue <ying.xue@...driver.com>
To:     Xin Long <lucien.xin@...il.com>,
        syzbot <syzbot+78fbe679c8ca8d264a8d@...kaller.appspotmail.com>
CC:     davem <davem@...emloft.net>, Jon Maloy <jon.maloy@...csson.com>,
        LKML <linux-kernel@...r.kernel.org>,
        network dev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        <tipc-discussion@...ts.sourceforge.net>
Subject: Re: memory leak in tipc_buf_acquire

On 6/10/19 2:44 AM, Xin Long wrote:
> Looks we need to purge each member's deferredq list in tipc_group_delete():
> diff --git a/net/tipc/group.c b/net/tipc/group.c
> index 992be61..23823eb 100644
> --- a/net/tipc/group.c
> +++ b/net/tipc/group.c
> @@ -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) {
>   tipc_group_proto_xmit(grp, m, GRP_LEAVE_MSG, &xmitq);
> + __skb_queue_purge(&m->deferredq);
>   list_del(&m->list);
>   kfree(m);
>   }

Good catch! I agree with you.