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=-1.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,UNWANTED_LANGUAGE_BODY, URIBL_BLOCKED autolearn=unavailable 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 E2172C4360F for ; Tue, 2 Apr 2019 13:44:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B23EB20856 for ; Tue, 2 Apr 2019 13:44:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732052AbfDBNox (ORCPT ); Tue, 2 Apr 2019 09:44:53 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:43446 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731476AbfDBNkI (ORCPT ); Tue, 2 Apr 2019 09:40:08 -0400 Received: from [167.98.27.226] (helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1hBJe0-0002oY-H3; Tue, 02 Apr 2019 14:40:04 +0100 Received: from ben by deadeye with local (Exim 4.92) (envelope-from ) id 1hBJdx-0004wv-M8; Tue, 02 Apr 2019 14:40:01 +0100 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, Denis Kirjanov , "Theodore Ts'o" , "Dmitry Monakhov" Date: Tue, 02 Apr 2019 14:38:28 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) X-Patchwork-Hint: ignore Subject: [PATCH 3.16 80/99] ext4: ext4_inline_data_fiemap should respect callers argument In-Reply-To: X-SA-Exim-Connect-IP: 167.98.27.226 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.65-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Dmitry Monakhov commit d952d69e268f833c85c0bafee9f67f9dba85044b upstream. Currently ext4_inline_data_fiemap ignores requested arguments (start and len) which may lead endless loop if start != 0. Also fix incorrect extent length determination. Signed-off-by: Dmitry Monakhov Signed-off-by: Theodore Ts'o [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings --- fs/ext4/ext4.h | 2 +- fs/ext4/extents.c | 3 ++- fs/ext4/inline.c | 19 +++++++++++++------ 3 files changed, 16 insertions(+), 8 deletions(-) --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2712,7 +2712,7 @@ extern struct buffer_head *ext4_get_firs int *retval); extern int ext4_inline_data_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, - int *has_inline); + int *has_inline, __u64 start, __u64 len); extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline); extern int ext4_convert_inline_data(struct inode *inode); --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -5153,7 +5153,8 @@ int ext4_fiemap(struct inode *inode, str if (ext4_has_inline_data(inode)) { int has_inline = 1; - error = ext4_inline_data_fiemap(inode, fieinfo, &has_inline); + error = ext4_inline_data_fiemap(inode, fieinfo, &has_inline, + start, len); if (has_inline) return error; --- a/fs/ext4/inline.c +++ b/fs/ext4/inline.c @@ -1816,11 +1816,12 @@ int ext4_destroy_inline_data(handle_t *h int ext4_inline_data_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, - int *has_inline) + int *has_inline, __u64 start, __u64 len) { __u64 physical = 0; - __u64 length; - __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_LAST; + __u64 inline_len; + __u32 flags = FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED | + FIEMAP_EXTENT_LAST; int error = 0; struct ext4_iloc iloc; @@ -1829,6 +1830,13 @@ int ext4_inline_data_fiemap(struct inode *has_inline = 0; goto out; } + inline_len = min_t(size_t, ext4_get_inline_size(inode), + i_size_read(inode)); + if (start >= inline_len) + goto out; + if (start + len < inline_len) + inline_len = start + len; + inline_len -= start; error = ext4_get_inode_loc(inode, &iloc); if (error) @@ -1837,11 +1845,10 @@ int ext4_inline_data_fiemap(struct inode physical = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits; physical += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data; physical += offsetof(struct ext4_inode, i_block); - length = i_size_read(inode); if (physical) - error = fiemap_fill_next_extent(fieinfo, 0, physical, - length, flags); + error = fiemap_fill_next_extent(fieinfo, start, physical, + inline_len, flags); brelse(iloc.bh); out: up_read(&EXT4_I(inode)->xattr_sem);