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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190715.110414.440652178176546301.davem@davemloft.net>
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.