From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from n169-113.mail.139.com (n169-113.mail.139.com [120.232.169.113]) (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 DD0C63A9DA1; Fri, 17 Apr 2026 08:22:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=120.232.169.113 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776414177; cv=none; b=HQ/l32N/Lx7zRVnHknPsLBtGwtwb2+mFufruXR9MTTe2qrV6Bu2ZEFa32gIz/GGQesTJZnQ8l9VitzNz53ppF3qsq31+CLo/c+fqTayByZ+50hZ1GI6mRr4zT3JA6c/UzOQFbdyxsg+/96u/BTaV5DIqk7O9+hKQ01Qwkzgjq6E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776414177; c=relaxed/simple; bh=KyWH9WrRsB7SfQ2c73Pw9DmEu/wFTMyZukemJdiPTF8=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version:Content-Type; b=btP8lvsbJhc3tbeG54Iq6lIkTuMztUaYxOssWFQ0jda76uJ+B2xuyLdw1XSGsk+q5ttdS1mQWq9eEZx3Xp3NKAs+hEiRyv5mB5pFqer9y4ErKYrzY5Ov9oHoETW6rN0/WOUGgmhNHMwwQR/9lK7tIpB4ZotWQC2lOigvP+6aAa0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=139.com; spf=pass smtp.mailfrom=139.com; dkim=pass (1024-bit key) header.d=139.com header.i=@139.com header.b=zwEg4qUI; arc=none smtp.client-ip=120.232.169.113 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=139.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=139.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=139.com header.i=@139.com header.b="zwEg4qUI" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=139.com; s=dkim; l=0; h=from:subject:message-id:to:cc:mime-version; bh=47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=; b=zwEg4qUIg1/tGPzrrQpOcDk59QqrIlaIwRV2jQN4W10McLBhudDx5/qYLqomtWKfPVKTXqRTAMc/p 0m0LK0/7YB5pLsZ5Mv11wRQo47KEIovjv764k3aG6CORfNS5scu2JDHnp3dnnU8NXwSpK6IfJuPbaU uAyIz9omibA+HLTE= X-RM-TagInfo: emlType=0 X-RM-SPAM: X-RM-SPAM-FLAG:00000000 Received:from NTT-kernel-dev (unknown[60.247.85.88]) by rmsmtp-lg-appmail-31-12045 (RichMail) with SMTP id 2f0d69e1edd2a2b-01a4b; Fri, 17 Apr 2026 16:22:43 +0800 (CST) X-RM-TRANSID:2f0d69e1edd2a2b-01a4b From: Li hongliang <1468888505@139.com> To: gregkh@linuxfoundation.org, stable@vger.kernel.org, pablo@netfilter.org Cc: patches@lists.linux.dev, linux-kernel@vger.kernel.org, kadlec@netfilter.org, fw@strlen.de, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, netdev@vger.kernel.org, giki.shergill@proton.me Subject: [PATCH 5.15.y] nf_tables: nft_dynset: fix possible stateful expression memleak in error path Date: Fri, 17 Apr 2026 16:22:42 +0800 Message-Id: <20260417082242.3254196-1-1468888505@139.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Pablo Neira Ayuso [ Upstream commit 0548a13b5a145b16e4da0628b5936baf35f51b43 ] If cloning the second stateful expression in the element via GFP_ATOMIC fails, then the first stateful expression remains in place without being released.   unreferenced object (percpu) 0x607b97e9cab8 (size 16):     comm "softirq", pid 0, jiffies 4294931867     hex dump (first 16 bytes on cpu 3):       00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     backtrace (crc 0):       pcpu_alloc_noprof+0x453/0xd80       nft_counter_clone+0x9c/0x190 [nf_tables]       nft_expr_clone+0x8f/0x1b0 [nf_tables]       nft_dynset_new+0x2cb/0x5f0 [nf_tables]       nft_rhash_update+0x236/0x11c0 [nf_tables]       nft_dynset_eval+0x11f/0x670 [nf_tables]       nft_do_chain+0x253/0x1700 [nf_tables]       nft_do_chain_ipv4+0x18d/0x270 [nf_tables]       nf_hook_slow+0xaa/0x1e0       ip_local_deliver+0x209/0x330 Fixes: 563125a73ac3 ("netfilter: nftables: generalize set extension to support for several expressions") Reported-by: Gurpreet Shergill Signed-off-by: Pablo Neira Ayuso Signed-off-by: Florian Westphal [ Minor conflict resolved. ] Signed-off-by: Li hongliang <1468888505@139.com> --- include/net/netfilter/nf_tables.h | 2 ++ net/netfilter/nf_tables_api.c | 4 ++-- net/netfilter/nft_dynset.c | 10 +++++++++- 3 files changed, 13 insertions(+), 3 deletions(-) diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h index 605d4c0a63e9..1f805590b838 100644 --- a/include/net/netfilter/nf_tables.h +++ b/include/net/netfilter/nf_tables.h @@ -821,6 +821,8 @@ void *nft_set_elem_init(const struct nft_set *set, u64 timeout, u64 expiration, gfp_t gfp); int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set, struct nft_expr *expr_array[]); +void nft_set_elem_expr_destroy(const struct nft_ctx *ctx, + struct nft_set_elem_expr *elem_expr); void nft_set_elem_destroy(const struct nft_set *set, void *elem, bool destroy_expr); void nf_tables_set_elem_destroy(const struct nft_ctx *ctx, diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index cbec5fc23719..b78949933acf 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -5919,8 +5919,8 @@ static void __nft_set_elem_expr_destroy(const struct nft_ctx *ctx, } } -static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx, - struct nft_set_elem_expr *elem_expr) +void nft_set_elem_expr_destroy(const struct nft_ctx *ctx, + struct nft_set_elem_expr *elem_expr) { struct nft_expr *expr; u32 size; diff --git a/net/netfilter/nft_dynset.c b/net/netfilter/nft_dynset.c index ecdd4a60db9c..673c5e6a3e8d 100644 --- a/net/netfilter/nft_dynset.c +++ b/net/netfilter/nft_dynset.c @@ -30,18 +30,26 @@ static int nft_dynset_expr_setup(const struct nft_dynset *priv, const struct nft_set_ext *ext) { struct nft_set_elem_expr *elem_expr = nft_set_ext_expr(ext); + struct nft_ctx ctx = { + .net = read_pnet(&priv->set->net), + .family = priv->set->table->family, + }; struct nft_expr *expr; int i; for (i = 0; i < priv->num_exprs; i++) { expr = nft_setelem_expr_at(elem_expr, elem_expr->size); if (nft_expr_clone(expr, priv->expr_array[i], GFP_ATOMIC) < 0) - return -1; + goto err_out; elem_expr->size += priv->expr_array[i]->ops->size; } return 0; +err_out: + nft_set_elem_expr_destroy(&ctx, elem_expr); + + return -1; } static void *nft_dynset_new(struct nft_set *set, const struct nft_expr *expr, -- 2.34.1