netdev - Re: [PATCH net v3] net: neigh: fix multiple neigh timer scheduling

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Date:   Mon, 15 Jul 2019 11:04:14 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     lorenzo.bianconi@...hat.com
Cc:     netdev@...r.kernel.org, dsahern@...il.com, marek@...udflare.com
Subject: Re: [PATCH net v3] net: neigh: fix multiple neigh timer scheduling

From: Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
Date: Sun, 14 Jul 2019 23:36:11 +0200

> Neigh timer can be scheduled multiple times from userspace adding
> multiple neigh entries and forcing the neigh timer scheduling passing
> NTF_USE in the netlink requests.
> This will result in a refcount leak and in the following dump stack:
 ...
> Fix the issue unscheduling neigh_timer if selected entry is in 'IN_TIMER'
> receiving a netlink request with NTF_USE flag set
> 
> Reported-by: Marek Majkowski <marek@...udflare.com>
> Fixes: 0c5c2d308906 ("neigh: Allow for user space users of the neighbour table")
> Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
> ---
> Changes since v2:
> - remove check_timer flag and run neigh_del_timer directly
> Changes since v1:
> - fix compilation errors defining neigh_event_send_check_timer routine

Applied and queued up for -stable, thanks.