From nobody Wed Dec 17 10:54:31 2025 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 60333C32772 for ; Tue, 23 Aug 2022 10:38:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355504AbiHWKil (ORCPT ); Tue, 23 Aug 2022 06:38:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44286 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1354662AbiHWKV5 (ORCPT ); Tue, 23 Aug 2022 06:21:57 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 746CE2DD9; Tue, 23 Aug 2022 02:03:21 -0700 (PDT) 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 dfw.source.kernel.org (Postfix) with ESMTPS id 48B6C61583; Tue, 23 Aug 2022 09:03:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5141AC433D6; Tue, 23 Aug 2022 09:03:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1661245395; bh=MUH9X5yO4wlFgKXfGRQ1GEK6wDBvOiKQnzrSbVhHJvk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AFhM64tCh4oRWcZx6agDIE+e0zxGlHojlnCZATI3FtkevpjzvoYMzGqdCiRjft6wZ FCl2ssQsL9lYkr+GBh5dnveOg8RH91GjszL4qIeR0N7CmQ1WCsDmqxHG0uNhVNiATj 3ByOD0L/93jd+m7bAkSe+a5BLss9JIF/Ezz4KwyQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, mingi cho , Florian Westphal , Pablo Neira Ayuso Subject: [PATCH 4.19 038/287] netfilter: nf_tables: fix null deref due to zeroed list head Date: Tue, 23 Aug 2022 10:23:27 +0200 Message-Id: <20220823080101.550008403@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220823080100.268827165@linuxfoundation.org> References: <20220823080100.268827165@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Florian Westphal commit 580077855a40741cf511766129702d97ff02f4d9 upstream. In nf_tables_updtable, if nf_tables_table_enable returns an error, nft_trans_destroy is called to free the transaction object. nft_trans_destroy() calls list_del(), but the transaction was never placed on a list -- the list head is all zeroes, this results in a null dereference: BUG: KASAN: null-ptr-deref in nft_trans_destroy+0x26/0x59 Call Trace: nft_trans_destroy+0x26/0x59 nf_tables_newtable+0x4bc/0x9bc [..] Its sane to assume that nft_trans_destroy() can be called on the transaction object returned by nft_trans_alloc(), so make sure the list head is initialised. Fixes: 55dd6f93076b ("netfilter: nf_tables: use new transaction infrastruct= ure to handle table") Reported-by: mingi cho Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- net/netfilter/nf_tables_api.c | 1 + 1 file changed, 1 insertion(+) --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -96,6 +96,7 @@ static struct nft_trans *nft_trans_alloc if (trans =3D=3D NULL) return NULL; =20 + INIT_LIST_HEAD(&trans->list); trans->msg_type =3D msg_type; trans->ctx =3D *ctx;