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 D382E1F76AD; Tue, 3 Dec 2024 15:50:11 +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=1733241011; cv=none; b=CXUkxhkkp3RWpt1879K59jXyCf/Ic0Bh1WWj9ihc4/Plj61yzTLhiiwOueXo0/qD5VdLpZ36OL7DZ54NfNGCB/3Bhi3eHApfw3EyBxMhFPdkJkqchUxzTo2M78/xZFokbQ0+qc9QCINW/vdwfG2oImUu4LFdwLp0vqxDpmIRlCA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733241011; c=relaxed/simple; bh=iMeVggwM8z+Oorzea8Xu3URj7DDLR43OE3Y3D+0dq94=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eiZVvNUvFwsdu2V+2PLjEV3VjSyyyagn5E/LSbNgYhvUE65Y6lM5dfw4iV1jUN8qH52HSGXPtfN2RM3z6lcgTnDR/faImEHk9nLYBZP3X9adUmL8UFr2zImUj4zvkN0pgYQZLlBEyrRuDddBtBdVrvsysHdcos828t8ewbaCv2c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=mP0Yvj8b; 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="mP0Yvj8b" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 425E6C4CED6; Tue, 3 Dec 2024 15:50:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1733241011; bh=iMeVggwM8z+Oorzea8Xu3URj7DDLR43OE3Y3D+0dq94=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mP0Yvj8bi33MgDF6UEDT251SRbmlXuU9PL0C04FyZUYxKOdZkpdhlZX5q/Zl3Vr+4 J4Lg03vakoni6mK7m3TNXLsbW7+R1ku378HadlmkwIQhezt7pmRY123Evnc3MvaVEs cwt9Qzlnq9ovf1UyrVdkdE06ioxmPdP6oRLOn2v8= 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 6.12 300/826] netfilter: nf_tables: must hold rcu read lock while iterating object type list Date: Tue, 3 Dec 2024 15:40:27 +0100 Message-ID: <20241203144755.467782370@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241203144743.428732212@linuxfoundation.org> References: <20241203144743.428732212@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 6.12-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 895e23d0dc36d..4a137afaf0b87 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -7805,9 +7805,7 @@ 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) @@ -7875,15 +7873,16 @@ 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