From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B654BC6FA8E for ; Sun, 26 Feb 2023 15:58:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229872AbjBZP6k (ORCPT ); Sun, 26 Feb 2023 10:58:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47494 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229783AbjBZP6k (ORCPT ); Sun, 26 Feb 2023 10:58:40 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3D1F793EB; Sun, 26 Feb 2023 07:58:38 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 0F309B80BD9; Sun, 26 Feb 2023 14:49:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7B285C433EF; Sun, 26 Feb 2023 14:49:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1677422981; bh=Y5YVjflQY8WSDinE6i39djcQTi3tvGmYWHHf8MpcLj8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VLRLHlMdaq27FXfugMl+j5dab7MBcx58rW0IegpFyjo3/WnxVgIWRILpS+ZJ2ulz5 lHHnomSN1L1RzUyxAgMg8tN+uDaiW4Lumi0aJ1SL4bvKGKxzMVVafeMMRVLQ3qTRpM mVlcND3367HRDJS3V4/1WgDKdF10BborfqYwNc9/4ZM9uQmADLirCO65h5ffnS9XLS CnFqiRpiZcyOpj0lezK61RncoA5nTvUC5H4xpQPjveGQv5ZiYKg1GOBrrLUGTkpHCe WBGRl2eOJ9rEwZnRY9QTdW2p5/CZTRfyvHMQYI//05FuuH86VVX41ZQXkfce7Jl4Ur KZL2BK0Mcr17g== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Alok Tiwari , Pablo Neira Ayuso , Sasha Levin , 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 Subject: [PATCH AUTOSEL 5.15 22/36] netfilter: nf_tables: NULL pointer dereference in nf_tables_updobj() Date: Sun, 26 Feb 2023 09:48:30 -0500 Message-Id: <20230226144845.827893-22-sashal@kernel.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230226144845.827893-1-sashal@kernel.org> References: <20230226144845.827893-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Alok Tiwari [ Upstream commit dac7f50a45216d652887fb92d6cd3b7ca7f006ea ] static analyzer detect null pointer dereference case for 'type' function __nft_obj_type_get() can return NULL value which require to handle if type is NULL pointer return -ENOENT. This is a theoretical issue, since an existing object has a type, but better add this failsafe check. Signed-off-by: Alok Tiwari Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/nf_tables_api.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 81bd13b3d8fd4..a02a25b7eae6d 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -6794,6 +6794,9 @@ static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info, return -EOPNOTSUPP; type = __nft_obj_type_get(objtype); + if (WARN_ON_ONCE(!type)) + return -ENOENT; + nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla); return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj); -- 2.39.0