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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E7CE0C77B7C for ; Fri, 26 May 2023 20:15:38 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4QSblF4TCyz3fGg for ; Sat, 27 May 2023 06:15:37 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.alibaba.com (client-ip=115.124.30.132; helo=out30-132.freemail.mail.aliyun.com; envelope-from=hsiangkao@linux.alibaba.com; receiver=) Received: from out30-132.freemail.mail.aliyun.com (out30-132.freemail.mail.aliyun.com [115.124.30.132]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4QSbkr4TpNz3fCy for ; Sat, 27 May 2023 06:15:16 +1000 (AEST) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R691e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046049;MF=hsiangkao@linux.alibaba.com;NM=1;PH=DS;RN=3;SR=0;TI=SMTPD_---0VjXYN6g_1685132112; Received: from e18g06460.et15sqa.tbsite.net(mailfrom:hsiangkao@linux.alibaba.com fp:SMTPD_---0VjXYN6g_1685132112) by smtp.aliyun-inc.com; Sat, 27 May 2023 04:15:13 +0800 From: Gao Xiang To: linux-erofs@lists.ozlabs.org Subject: [PATCH 6/6] erofs: use poison pointer to replace the hard-coded address Date: Sat, 27 May 2023 04:14:59 +0800 Message-Id: <20230526201459.128169-7-hsiangkao@linux.alibaba.com> X-Mailer: git-send-email 2.24.4 In-Reply-To: <20230526201459.128169-1-hsiangkao@linux.alibaba.com> References: <20230526201459.128169-1-hsiangkao@linux.alibaba.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linux-erofs@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development of Linux EROFS file system List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Gao Xiang , LKML Errors-To: linux-erofs-bounces+linux-erofs=archiver.kernel.org@lists.ozlabs.org Sender: "Linux-erofs" It's safer and cleaner to replace such hard-coded illegal pointer with poison pointers. Signed-off-by: Gao Xiang --- fs/erofs/zdata.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c index 2ea8e7f08372..83df1954b859 100644 --- a/fs/erofs/zdata.c +++ b/fs/erofs/zdata.c @@ -91,10 +91,8 @@ struct z_erofs_pcluster { struct z_erofs_bvec compressed_bvecs[]; }; -/* let's avoid the valid 32-bit kernel addresses */ - /* the end of a chain of pclusters */ -#define Z_EROFS_PCLUSTER_TAIL ((void *)0x5F0ECAFE) +#define Z_EROFS_PCLUSTER_TAIL ((void *) 0x700 + POISON_POINTER_DELTA) #define Z_EROFS_PCLUSTER_NIL (NULL) struct z_erofs_decompressqueue { -- 2.24.4