From: "Paul E. McKenney" <[email protected]>
Date: Mon, 29 Oct 2007 14:15:40 -0700
> net/decnet/dn_route.c in dn_rt_cache_get_next() is as follows:
>
> static struct dn_route *dn_rt_cache_get_next(struct seq_file *seq, struct dn_route *rt)
> {
> struct dn_rt_cache_iter_state *s = rcu_dereference(seq->private);
>
> rt = rt->u.dst.dn_next;
> while(!rt) {
> rcu_read_unlock_bh();
> if (--s->bucket < 0)
> break;
>
> ... But what happens if seq->private is freed up right here?
> ... Or what prevents this from happening?
...
> Similar code is in rt_cache_get_next().
>
> So, what am I missing here?
seq->private is allocated on file open (here via seq_open_private()),
and freed up on file close (via seq_release_private).
So it cannot be freed up in the middle of an iteration.
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