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 055E9C38142 for ; Tue, 23 Aug 2022 08:18:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242732AbiHWISg (ORCPT ); Tue, 23 Aug 2022 04:18:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42834 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243081AbiHWIQd (ORCPT ); Tue, 23 Aug 2022 04:16:33 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 21540C6D; Tue, 23 Aug 2022 01:11:16 -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 B1F38612DA; Tue, 23 Aug 2022 08:11:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9D893C433D6; Tue, 23 Aug 2022 08:11:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1661242275; bh=VBY8pSavty0a8/be3ESWT8pu5JPwtob0ZB5UChZI1Fg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TvrNcQFl8RqnBoekP9GA5ksXnvjzJXIUQhkPIgHRaCXuL88w2r6+e4RIkMfZnHqoo eMbISDkG7BZjwqlPfJ4veHP9x8Z/cEnRaQJkjm2R0KXvLCYw4DgMGLquo/RAY/D0JD 0es6HQ+EU7mMYRwWsuoNWmC9COzMbMJDWubAFRY8= 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 4.9 046/101] netfilter: nf_tables: fix null deref due to zeroed list head Date: Tue, 23 Aug 2022 10:03:19 +0200 Message-Id: <20220823080036.308057139@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220823080034.579196046@linuxfoundation.org> References: <20220823080034.579196046@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 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 infrastructure 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 @@ -119,6 +119,7 @@ static struct nft_trans *nft_trans_alloc if (trans == NULL) return NULL; + INIT_LIST_HEAD(&trans->list); trans->msg_type = msg_type; trans->ctx = *ctx;