netdev - Re: [PATCH net-next] net: bridge: Lock before br_fdb

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 for Android: free password hash cracker in your pocket

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

Date:   Mon, 28 May 2018 18:52:41 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Petr Machata <petrm@...lanox.com>,
        bridge@...ts.linux-foundation.org, netdev@...r.kernel.org
Cc:     stephen@...workplumber.org, davem@...emloft.net
Subject: Re: [PATCH net-next] net: bridge: Lock before br_fdb_find()

On 28/05/18 18:44, Petr Machata wrote:
> Callers of br_fdb_find() need to hold the hash lock, which
> br_fdb_find_port() doesn't do. Add the missing lock/unlock
> pair.
> 
> Signed-off-by: Petr Machata <petrm@...lanox.com>
> ---
>  net/bridge/br_fdb.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
> index b19e310..3f5691a 100644
> --- a/net/bridge/br_fdb.c
> +++ b/net/bridge/br_fdb.c
> @@ -135,9 +135,11 @@ struct net_device *br_fdb_find_port(const struct net_device *br_dev,
>  		return NULL;
>  
>  	br = netdev_priv(br_dev);
> +	spin_lock_bh(&br->hash_lock);
>  	f = br_fdb_find(br, addr, vid);
>  	if (f && f->dst)
>  		dev = f->dst->dev;
> +	spin_unlock_bh(&br->hash_lock);
>  
>  	return dev;
>  }
> 

There's also a lockdep assert for hash_lock in br_find_fdb().

Acked-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>