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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 03AE0C2BB55 for ; Thu, 16 Apr 2020 15:34:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CF5D221927 for ; Thu, 16 Apr 2020 15:34:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587051295; bh=GMCeEdBjC+Mv67Ici8GialvdPUryQ4WJJTJWdXnnZhc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=T8cPRHOQFHWrsg0ri2UqjPUWZactlCeMR68k6s7AqcH9WOCw9Hd6nDJw+nQiEnYJ1 rW94yu9GgmJUQogOmfrKVzBE51KC/wP5yghsRDNppxur4gf6ZMmmE/QXnM6ZzmovTi hRyi7WcobMVaPXTQwFmEzEOJVRbuBiNuP2GFgLSU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2395295AbgDPPey (ORCPT ); Thu, 16 Apr 2020 11:34:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:53488 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2898187AbgDPNkr (ORCPT ); Thu, 16 Apr 2020 09:40:47 -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 56A27218AC; Thu, 16 Apr 2020 13:40:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587044446; bh=GMCeEdBjC+Mv67Ici8GialvdPUryQ4WJJTJWdXnnZhc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=M2sDBZgGAaU4f+Df9W1DFkxPK1LcSciMllcndxjH4pfQyxFQw6q+CcvHx7RdIY7G6 91AhZWecxXteFP/IEwhv9MteylxJy018wECjVhu+ZpP6zbcG8BSA4J2Zs9xMX6d/x0 ameqVB3hi5tVZ8tY+nKsfHUaiCJ6teL7n9eRiGlc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Changwei Ge , Andrew Morton , Joseph Qi , Mark Fasheh , Joel Becker , Junxiao Bi , Changwei Ge , Gang He , Jun Piao , Linus Torvalds Subject: [PATCH 5.5 222/257] ocfs2: no need try to truncate file beyond i_size Date: Thu, 16 Apr 2020 15:24:33 +0200 Message-Id: <20200416131353.671263826@linuxfoundation.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200416131325.891903893@linuxfoundation.org> References: <20200416131325.891903893@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: Changwei Ge commit 783fda856e1034dee90a873f7654c418212d12d7 upstream. Linux fallocate(2) with FALLOC_FL_PUNCH_HOLE mode set, its offset can exceed the inode size. Ocfs2 now doesn't allow that offset beyond inode size. This restriction is not necessary and violates fallocate(2) semantics. If fallocate(2) offset is beyond inode size, just return success and do nothing further. Otherwise, ocfs2 will crash the kernel. kernel BUG at fs/ocfs2//alloc.c:7264! ocfs2_truncate_inline+0x20f/0x360 [ocfs2] ocfs2_remove_inode_range+0x23c/0xcb0 [ocfs2] __ocfs2_change_file_space+0x4a5/0x650 [ocfs2] ocfs2_fallocate+0x83/0xa0 [ocfs2] vfs_fallocate+0x148/0x230 SyS_fallocate+0x48/0x80 do_syscall_64+0x79/0x170 Signed-off-by: Changwei Ge Signed-off-by: Andrew Morton Reviewed-by: Joseph Qi Cc: Mark Fasheh Cc: Joel Becker Cc: Junxiao Bi Cc: Changwei Ge Cc: Gang He Cc: Jun Piao Cc: Link: http://lkml.kernel.org/r/20200407082754.17565-1-chge@linux.alibaba.com Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- fs/ocfs2/alloc.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/fs/ocfs2/alloc.c +++ b/fs/ocfs2/alloc.c @@ -7403,6 +7403,10 @@ int ocfs2_truncate_inline(struct inode * struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; struct ocfs2_inline_data *idata = &di->id2.i_data; + /* No need to punch hole beyond i_size. */ + if (start >= i_size_read(inode)) + return 0; + if (end > i_size_read(inode)) end = i_size_read(inode);