From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 10 Oct 2016 12:05:17 -0700
> David - I think that also explains what was wrong with the old code.
> In the old code, this loop:
>
> while (hooks_entry && nf_entry_dereference(hooks_entry->next)) {
>
> would exit with "hooks_entry" pointing to the last list entry (because
> ->next was NULL). Nothing was ever unlinked in the loop itself,
> because it never actually found a matching entry, but then after the
> loop it would free that last entry because it *thought* that was the
> match.
It only does this when the ops don't match, but yes it can happen.
Linus can you add some extra info to that:
WARN(1, "nf_unregister_net_hook: hook not found!\n");
diagnostic, such as the reg->pf and reg->hooknum values?
That might help track down why this is happening in the first
place.
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