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 5B60651FCB2; Wed, 30 Sep 2026 18:00:21 +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=1790791222; cv=none; b=mcdrchyNKSrZ7/WwqkY0SOKIPTiXfHool5A+Rdg1xOMfOUyvqDfGZX+zYrBzSS8ITdq7Ir2CHHi64W/U5+H9e7aH/ClEQNlcNiNx/mzr1ERuRSeyht4uiMzNg+kAguHyUxfc7he+JFDAj76sOihhj3f2qNaHZLlduc2+Gvprjp0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790791222; c=relaxed/simple; bh=ws+CeLjp8EKjdvN8DYDUJw4dg03lKTWEPdEKoitKJC8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BGYgYgVj/Nbj93x7vNv1GSYkiLH0OYNYRxEVCpFXfbdcScLCwZ3YZksq3KnESrvkmQ7VLhkmVMkXtnzKKj43c+dWTZ2mfKZ3wtU3X2Vowffb2EJumXEptSvOf+UTyZLvxuNHl1++QaAbmYvbhmaT1HfonyqZRJZJwjotF/zclJU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=mVkQWNX3; 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="mVkQWNX3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ACCCD1F000FF; Wed, 30 Sep 2026 18:00:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790791221; bh=ac32ZeFFucnFX0C0Vqr4ihPnV2WbpSnc9A+L8eiX67Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=mVkQWNX3eqdSuG/A+XZEIHgiyCDhNdWHSt+RUFPNVP16RJkKP5FORW05hxEpgM2G6 2Pe3S6ibAfZlsr/VAdGSCXxdShsS/Hrhn0Zt/kij6vKItSkd2tDK0JgAPfTqZ0Z7SX SvNzvAsCjLcIuQjlEg9qelWoYB9TSK89CY99Aqtw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Florian Westphal , Sasha Levin Subject: [PATCH 5.15 181/752] netfilter: nf_conntrack_expect: zero at allocation time Date: Wed, 30 Sep 2026 17:20:51 +0200 Message-ID: <20260930152402.121052064@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152358.131179731@linuxfoundation.org> References: <20260930152358.131179731@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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Florian Westphal [ Upstream commit 241ccd2fed9051db443aadce248fc0ab30f55e97 ] There are occasional LLM hints wrt. leaking uninitialized data to userspace via ctnetlink. Just zero at allocation time, expectations are not frequently used these days. Intentionally keeps _init as-is because we could theoretically support re-init, so add the missing exp->dir there. Signed-off-by: Florian Westphal Signed-off-by: Sasha Levin --- net/netfilter/nf_conntrack_expect.c | 3 ++- net/netfilter/nf_conntrack_netlink.c | 11 +---------- 2 files changed, 3 insertions(+), 11 deletions(-) diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c index 6d056ebba57c6..fd83dbfccaced 100644 --- a/net/netfilter/nf_conntrack_expect.c +++ b/net/netfilter/nf_conntrack_expect.c @@ -299,7 +299,7 @@ struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me) { struct nf_conntrack_expect *new; - new = kmem_cache_alloc(nf_ct_expect_cachep, GFP_ATOMIC); + new = kmem_cache_zalloc(nf_ct_expect_cachep, GFP_ATOMIC); if (!new) return NULL; @@ -363,6 +363,7 @@ void nf_ct_expect_init(struct nf_conntrack_expect *exp, unsigned int class, #if IS_ENABLED(CONFIG_NF_NAT) memset(&exp->saved_addr, 0, sizeof(exp->saved_addr)); memset(&exp->saved_proto, 0, sizeof(exp->saved_proto)); + exp->dir = 0; #endif } EXPORT_SYMBOL_GPL(nf_ct_expect_init); diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c index da00a770ca6d6..699668d1fdb26 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -3552,8 +3552,6 @@ ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct, if (cda[CTA_EXPECT_FLAGS]) { exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS])); exp->flags &= ~NF_CT_EXPECT_USERSPACE; - } else { - exp->flags = 0; } if (cda[CTA_EXPECT_FN]) { const char *name = nla_data(cda[CTA_EXPECT_FN]); @@ -3565,8 +3563,7 @@ ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct, goto err_out; } exp->expectfn = expfn->expectfn; - } else - exp->expectfn = NULL; + } exp->class = class; exp->master = ct; @@ -3580,12 +3577,6 @@ ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct, exp, nf_ct_l3num(ct)); if (err < 0) goto err_out; -#if IS_ENABLED(CONFIG_NF_NAT) - } else { - memset(&exp->saved_addr, 0, sizeof(exp->saved_addr)); - memset(&exp->saved_proto, 0, sizeof(exp->saved_proto)); - exp->dir = 0; -#endif } return exp; err_out: -- 2.53.0