From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 BA8AF213E6B; Thu, 12 Dec 2024 16:51:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734022301; cv=none; b=krl6TkAPBmeJwu4QcdjNjQawXlQKKwGrXNmRFlCwesLRqEGDVNwjfiZwmJ4IEH+CxbVjoVLMY84F0h1H47SzDDQtmItEZmBtbz/djlPGhJhLoo8S5yiXBHggTRpdvE/eqrjSBCWySc2U7BLdGayCjnBNiyE3nv9f34J/myFgWj0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734022301; c=relaxed/simple; bh=H0zysKh6px2obvmXtNtxL+UBO4KbXq0sSuIzRCe3Fh0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fvU76VqaKpE3/3lVENFL0d/TE7ukYnsH777ynmhBQLgPRT00/14rixdqbKWbSxdLFoeB9R6xAFHhKQyQLwasb4VR2ot/D2Bo5frSK0kEfhzA6TkdwGg1OTkWR3yTYz5KIx8DjLmaN0ZXMgmaUmUnoQtwiY3d8x2i4kcZnUHQpO8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=UmSnHfw6; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="UmSnHfw6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 395E8C4CECE; Thu, 12 Dec 2024 16:51:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1734022301; bh=H0zysKh6px2obvmXtNtxL+UBO4KbXq0sSuIzRCe3Fh0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UmSnHfw6JlN7caJ/ElKgryGCk14dDj1fYXqmaRXZMepSg3ROeQjDs0zL/3AqJtd4S D2FnhL0A0p7ZjtiTFw3yfw5niA7XlI2/JYow40Va2brez6NDF94diZk5FGfQSsnh82 RnXnHhhTb2ilf7JU5OekuIOKILW7hLGHkysOMG0g= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Florian Westphal , Pablo Neira Ayuso , Sasha Levin Subject: [PATCH 5.15 187/565] netfilter: nf_tables: must hold rcu read lock while iterating object type list Date: Thu, 12 Dec 2024 15:56:22 +0100 Message-ID: <20241212144318.872673501@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241212144311.432886635@linuxfoundation.org> References: <20241212144311.432886635@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org 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 cddc04275f95ca3b18da5c0fb111705ac173af89 ] Update of stateful object triggers: WARNING: suspicious RCU usage net/netfilter/nf_tables_api.c:7759 RCU-list traversed in non-reader section!! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by nft/3060: #0: ffff88810f0578c8 (&nft_net->commit_mutex){+.+.}-{4:4}, [..] ... but this list is not protected by the transaction mutex but the nfnl nftables subsystem mutex. Switch to nft_obj_type_get which will acquire rcu read lock, bump refcount, and returns the result. v3: Dan Carpenter points out nft_obj_type_get returns error pointer, not NULL, on error. Fixes: dad3bdeef45f ("netfilter: nf_tables: fix memory leak during stateful obj update"). Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/nf_tables_api.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 20e2f2deb336d..7fdeed8a31866 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -7115,9 +7115,7 @@ static int nf_tables_updobj(const struct nft_ctx *ctx, struct nft_trans *trans; int err = -ENOMEM; - if (!try_module_get(type->owner)) - return -ENOENT; - + /* caller must have obtained type->owner reference. */ trans = nft_trans_alloc(ctx, NFT_MSG_NEWOBJ, sizeof(struct nft_trans_obj)); if (!trans) @@ -7185,15 +7183,16 @@ static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info, if (info->nlh->nlmsg_flags & NLM_F_REPLACE) return -EOPNOTSUPP; - type = __nft_obj_type_get(objtype, family); - if (WARN_ON_ONCE(!type)) - return -ENOENT; - if (!obj->ops->update) return 0; + type = nft_obj_type_get(net, objtype, family); + if (WARN_ON_ONCE(IS_ERR(type))) + return PTR_ERR(type); + nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); + /* type->owner reference is put when transaction object is released. */ return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj); } -- 2.43.0