From: Eric Dumazet <[email protected]> Date: Sun, 05 Dec 2010 21:53:52 +0100
> [PATCH] filter: fix sk_filter rcu handling > > Pavel Emelyanov tried to fix a race between sk_filter_(de|at)tach and > sk_clone() in commit 47e958eac280c263397 > > Problem is we can have several clones sharing a common sk_filter, and > these clones might want to sk_filter_attach() their own filters at the > same time, and can overwrite old_filter->rcu, corrupting RCU queues. > > We can not use filter->rcu without being sure no other thread could do > the same thing. > > Switch code to a more conventional ref-counting technique : Do the > atomic decrement immediately and queue one rcu call back when last > reference is released. > > Signed-off-by: Eric Dumazet <[email protected]> Applied, and queued up for -stable, thanks. _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
