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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Calling the nftnl_set_free function may trigger the "double free" problem."
   href="https://bugzilla.netfilter.org/show_bug.cgi?id=1685#c7">Comment # 7</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Calling the nftnl_set_free function may trigger the "double free" problem."
   href="https://bugzilla.netfilter.org/show_bug.cgi?id=1685">bug 1685</a>
              from <span class="vcard"><a class="email" href="mailto:pablo@netfilter.org" title="Pablo Neira Ayuso <pablo@netfilter.org>"> <span class="fn">Pablo Neira Ayuso</span></a>
</span></b>
        <pre><span class="quote">> diff --git a/src/set.c b/src/set.c
> index c46f827..738cc24 100644
> --- a/src/set.c
> +++ b/src/set.c
> @@ -54,8 +54,11 @@ void nftnl_set_free(const struct nftnl_set *s)
>         if (s->flags & (1 << NFTNL_SET_USERDATA))
>                 xfree(s->user.data);

> -       list_for_each_entry_safe(expr, next, &s->expr_list, head)
> -               nftnl_expr_free(expr);
> +       if (s->flags & (1 << NFTNL_SET_EXPR))
> +       {
> +               list_for_each_entry_safe(expr, next, &s->expr_list, head)
> +                       nftnl_expr_free(expr);
> +       }</span >

Maybe this instead?

          list_for_each_entry_safe(expr, next, &s->expr_list, head) {
                  list_del(&expr->list);
                  nftnl_expr_free(expr);
          }</pre>
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