From: Lorenzo Bianconi <lorenzo.bianc...@redhat.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 <ma...@cloudflare.com>
> Fixes: 0c5c2d308906 ("neigh: Allow for user space users of the neighbour
> table")
> Signed-off-by: Lorenzo Bianconi <lorenzo.bianc...@redhat.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.
