From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 518B35172EC; Wed, 30 Sep 2026 16:14:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790784863; cv=none; b=oiMup4I45SosHUD9sEjNeqs/HOq90tL+zGkcB3avAHaQHEZqw0OBHUHbkzcWq7WlpxeG/ma8+GISDa5ZwJt0DwwxF7rNkJ38l66cFgr03wNixWd9wmXY9S4Awu63xCEGUrNW0zehqLvIWqjRZPxthfIo4nyL6qPulElKBZf2gSs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790784863; c=relaxed/simple; bh=KKARSUF+BLvnN52yzdx4KgBiNmiqftyja771lJQObow=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ddl+HAqRk+jf2sS+l9iht2WuSC9ffofELKgDttVAFf+U/FLA6mFvnoxKWQOgE8HUOqRn08UWPCuz4SqhT/+f7WGhGmJjZT+ch+uXsPaFDt7twCjDUpgnExwNEHwR5djfMFMXUh2CMfaZKO7Rdj0TGHiDGPbLFuGUuJm7VMfsygM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Dbgt8zuY; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Dbgt8zuY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 394151F00898; Wed, 30 Sep 2026 16:14:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790784855; bh=BkDnPDcuaA8L1tNGX6zl1ah9CPs0S1op6pNOzFXpZBw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Dbgt8zuYPKgsA5A5qrsvSTDctDXvnhbStQp+ID6zYSdvFasr2EoaIEDbhH8/OL4pN rOYnacDBVTYAGufGBa1lM336eVaaWlByNRIu+eaZ1FLP6chPI/iGjoKxui5AmheSmz MwOTp214spyNlftHWzs+3sS2FVVjIWZWc4c5gpZU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jozsef Kadlecsik , Florian Westphal , Sasha Levin Subject: [PATCH 6.1 258/982] netfilter: ipset: mark the rcu locked areas properly Date: Wed, 30 Sep 2026 17:16:34 +0200 Message-ID: <20260930152422.336967013@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152416.775402466@linuxfoundation.org> References: <20260930152416.775402466@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jozsef Kadlecsik [ Upstream commit 5d0c22e73656d050daffad10a2ba8765ce8441c8 ] When we bump the uref counter, there's no need to keep the rcu lock because the referred hash table can't disappear. Also, from the same reason in mtype_gc we need the rcu lock and not a spinlock. Signed-off-by: Jozsef Kadlecsik Signed-off-by: Florian Westphal Signed-off-by: Sasha Levin --- net/netfilter/ipset/ip_set_hash_gen.h | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/net/netfilter/ipset/ip_set_hash_gen.h b/net/netfilter/ipset/ip_set_hash_gen.h index 6588571648ead..a4ec28b223c4d 100644 --- a/net/netfilter/ipset/ip_set_hash_gen.h +++ b/net/netfilter/ipset/ip_set_hash_gen.h @@ -556,9 +556,10 @@ mtype_gc(struct work_struct *work) set = gc->set; h = set->data; - spin_lock_bh(&set->lock); - t = ipset_dereference_set(h->table, set); + rcu_read_lock_bh(); + t = rcu_dereference_bh(h->table); atomic_inc(&t->uref); + rcu_read_unlock_bh(); numof_locks = ahash_numof_locks(t->htable_bits); r = gc->region++; if (r >= numof_locks) { @@ -567,7 +568,6 @@ mtype_gc(struct work_struct *work) next_run = (IPSET_GC_PERIOD(set->timeout) * HZ) / numof_locks; if (next_run < HZ/10) next_run = HZ/10; - spin_unlock_bh(&set->lock); mtype_gc_do(set, h, t, r); @@ -847,15 +847,13 @@ mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext, key = HKEY(value, h->initval, t->htable_bits); r = ahash_region(key); atomic_inc(&t->uref); + rcu_read_unlock_bh(); elements = t->hregion[r].elements; maxelem = t->maxelem; if (elements >= maxelem) { u32 e; - if (SET_WITH_TIMEOUT(set)) { - rcu_read_unlock_bh(); + if (SET_WITH_TIMEOUT(set)) mtype_gc_do(set, h, t, r); - rcu_read_lock_bh(); - } maxelem = h->maxelem; elements = 0; for (e = 0; e < ahash_numof_locks(t->htable_bits); e++) @@ -863,7 +861,6 @@ mtype_add(struct ip_set *set, void *value, const struct ip_set_ext *ext, if (elements >= maxelem && SET_WITH_FORCEADD(set)) forceadd = true; } - rcu_read_unlock_bh(); spin_lock_bh(&t->hregion[r].lock); n = rcu_dereference_bh(hbucket(t, key)); -- 2.53.0