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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3F672C4360C for ; Sun, 6 Oct 2019 17:37:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0FA9B20862 for ; Sun, 6 Oct 2019 17:37:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570383430; bh=YGkScx/jhGS2Nre6fZSEF/CTkWusNS3dmBmk4gEMASw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Al1LFvctium8nWw3sIYSZhAJIJ96htSFVH1HIRMaTeIdl7UU/a9jSpVat0AStCacw 72kVHTx5ASc7pG17bIVHS+TAHOibOCzFp1Fa/vkrOXU0lkmj1i1pGGAtmhRN4kzaoK ykQ+8BvHzsUcnoRDj1ZKjotKmbmdPboL/+DbdCZ0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727200AbfJFRhJ (ORCPT ); Sun, 6 Oct 2019 13:37:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:35974 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730375AbfJFRhF (ORCPT ); Sun, 6 Oct 2019 13:37:05 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2FDF721479; Sun, 6 Oct 2019 17:37:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570383424; bh=YGkScx/jhGS2Nre6fZSEF/CTkWusNS3dmBmk4gEMASw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cM+sPkttkYrZ5bbMIgI/5hW0SPIde7DEO7HTbTTz0pm3zzJheCXm0RgZ1HU+0tzwa N1YirJlwpQaeRkBXbbnGyjSzjK3BKzupj3RybEletbhMFXL/kIRUZleFVvQUaiCpKH BA+gyQY7SEZ5xpgjKBKDt4PVit/QDQzzfn5IfV8Q= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Miroslav Benes , Petr Mladek , Josh Poimboeuf , Sasha Levin Subject: [PATCH 5.2 100/137] livepatch: Nullify obj->mod in klp_module_coming()s error path Date: Sun, 6 Oct 2019 19:21:24 +0200 Message-Id: <20191006171217.241438193@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191006171209.403038733@linuxfoundation.org> References: <20191006171209.403038733@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Miroslav Benes [ Upstream commit 4ff96fb52c6964ad42e0a878be8f86a2e8052ddd ] klp_module_coming() is called for every module appearing in the system. It sets obj->mod to a patched module for klp_object obj. Unfortunately it leaves it set even if an error happens later in the function and the patched module is not allowed to be loaded. klp_is_object_loaded() uses obj->mod variable and could currently give a wrong return value. The bug is probably harmless as of now. Signed-off-by: Miroslav Benes Reviewed-by: Petr Mladek Acked-by: Josh Poimboeuf Signed-off-by: Petr Mladek Signed-off-by: Sasha Levin --- kernel/livepatch/core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c index c4ce08f43bd63..ab4a4606d19b7 100644 --- a/kernel/livepatch/core.c +++ b/kernel/livepatch/core.c @@ -1175,6 +1175,7 @@ err: pr_warn("patch '%s' failed for module '%s', refusing to load module '%s'\n", patch->mod->name, obj->mod->name, obj->mod->name); mod->klp_alive = false; + obj->mod = NULL; klp_cleanup_module_patches_limited(mod, patch); mutex_unlock(&klp_mutex); -- 2.20.1