netfilter: nft_set_pipapo: stop GC iteration if GC transaction allocation fails

JIRA: https://issues.redhat.com/browse/RHEL-1720
JIRA: https://issues.redhat.com/browse/RHEL-1721
Upstream Status: commit 6d365ea

commit 6d365ea
Author: Pablo Neira Ayuso <pablo@netfilter.org>
Date:   Wed Sep 6 17:22:58 2023 +0200

    netfilter: nft_set_pipapo: stop GC iteration if GC transaction allocation fails

    nft_trans_gc_queue_sync() enqueues the GC transaction and it allocates a
    new one. If this allocation fails, then stop this GC sync run and retry
    later.

    Fixes: 5f68718 ("netfilter: nf_tables: GC transaction API to avoid race with control plane")
    Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Signed-off-by: Florian Westphal <fwestpha@redhat.com>

Author: fw-strlen

net/netfilter/nft_set_pipapo.c

@@ -1597,7 +1597,7 @@ static void pipapo_gc(const struct nft_set *_set, struct nft_pipapo_match *m)
 
 			gc = nft_trans_gc_queue_sync(gc, GFP_ATOMIC);
 			if (!gc)
-				break;
+				return;
 
 			nft_pipapo_gc_deactivate(net, set, e);
 			pipapo_drop(m, rulemap);