Re: [PATCH v2] inetpeer: fix a race in inetpeer_gc_worker()

From: Steffen Klassert <steffen.klassert@secunet.com>
Date: Tue, 5 Jun 2012 15:09:54 +0200

On Tue, Jun 05, 2012 at 03:00:18PM +0200, Eric Dumazet wrote:

quoted

From: Eric Dumazet <edumazet@google.com>

commit 5faa5df1fa2024 (inetpeer: Invalidate the inetpeer tree along with
the routing cache) added a race :

Before freeing an inetpeer, we must respect a RCU grace period, and make
sure no user will attempt to increase refcnt.

inetpeer_invalidate_tree() waits for a RCU grace period before inserting
inetpeer tree into gc_list and waking the worker. At that time, no
concurrent lookup can find a inetpeer in this tree.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>

Acked-by: Steffen Klassert <steffen.klassert@secunet.com>

I'll apply this and queue it up for -stable, thanks.