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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B72AFC433F5 for ; Mon, 25 Oct 2021 19:29:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9E74060187 for ; Mon, 25 Oct 2021 19:29:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235502AbhJYTcF (ORCPT ); Mon, 25 Oct 2021 15:32:05 -0400 Received: from mail.kernel.org ([198.145.29.99]:48326 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235445AbhJYT2h (ORCPT ); Mon, 25 Oct 2021 15:28:37 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id EBB4761076; Mon, 25 Oct 2021 19:24:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1635189889; bh=ZrsSBy57D8kFBiyUQ0yK6wBXOGDqNSH03H8z0Pjfs1g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UY64KpKeSW+WqYb98NTN9CgIwS0Ed1x5F+GtR3XyuPpDyGQKCX15dn6fkoZhrx4Jm PQi4+0anMpq5A2hG76137m5uu6L+9Ew42muE9X5vVZtUG0DWHA29S4BLrlIgQu15oB frFmybJLFjMwaEj3YV4W1sVSgFShioECDmlRIy80= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Krzysztof Kozlowski , Lin Ma , "David S. Miller" Subject: [PATCH 4.19 23/37] nfc: nci: fix the UAF of rf_conn_info object Date: Mon, 25 Oct 2021 21:14:48 +0200 Message-Id: <20211025190932.930213006@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211025190926.680827862@linuxfoundation.org> References: <20211025190926.680827862@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lin Ma commit 1b1499a817c90fd1ce9453a2c98d2a01cca0e775 upstream. The nci_core_conn_close_rsp_packet() function will release the conn_info with given conn_id. However, it needs to set the rf_conn_info to NULL to prevent other routines like nci_rf_intf_activated_ntf_packet() to trigger the UAF. Reviewed-by: Krzysztof Kozlowski Signed-off-by: Lin Ma Signed-off-by: Krzysztof Kozlowski Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/nfc/nci/rsp.c | 2 ++ 1 file changed, 2 insertions(+) --- a/net/nfc/nci/rsp.c +++ b/net/nfc/nci/rsp.c @@ -289,6 +289,8 @@ static void nci_core_conn_close_rsp_pack ndev->cur_conn_id); if (conn_info) { list_del(&conn_info->list); + if (conn_info == ndev->rf_conn_info) + ndev->rf_conn_info = NULL; devm_kfree(&ndev->nfc_dev->dev, conn_info); } }