File ext2fs-update-allocation-info-earlier-in-ext2fs_mkdi.patch of Package e2fsprogs.15537

From a25a84c6aa2a19987b0aeced363c4bf1dcc89ec8 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Thu, 13 Feb 2020 11:15:58 +0100
Subject: [PATCH 1/5] ext2fs: update allocation info earlier in ext2fs_mkdir()
 and ext2fs_symlink()
References: bsc#1160979

Currently, ext2fs_mkdir() and ext2fs_symlink() update allocation bitmaps
and other information only close to the end of the function, in
particular after calling to ext2fs_link(). When ext2fs_link() will
support indexed directories, it will also need to allocate blocks and
that would cause filesystem corruption in case allocation info isn't
properly updated. So make sure ext2fs_mkdir() and ext2fs_symlink()
update allocation info before calling into ext2fs_link().

[ Added error handling so the calls to ext2fs_{block,inode}_alloc_stats()
  can be undone if the newly created directory or symlink can not be linked
  into the directory. -- TYT ]

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Acked-by: Jan Kara <jack@suse.cz>
---
 lib/ext2fs/mkdir.c   | 22 +++++++++++++++-------
 lib/ext2fs/symlink.c | 22 +++++++++++++++-------
 2 files changed, 30 insertions(+), 14 deletions(-)

Index: e2fsprogs-1.43.8/lib/ext2fs/mkdir.c
===================================================================
--- e2fsprogs-1.43.8.orig/lib/ext2fs/mkdir.c
+++ e2fsprogs-1.43.8/lib/ext2fs/mkdir.c
@@ -43,6 +43,7 @@ errcode_t ext2fs_mkdir(ext2_filsys fs, e
 	blk64_t			blk;
 	char			*block = 0;
 	int			inline_data = 0;
+	int			drop_refcount = 0;
 
 	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
 
@@ -144,6 +145,14 @@ errcode_t ext2fs_mkdir(ext2_filsys fs, e
 	}
 
 	/*
+	 * Update accounting....
+	 */
+	if (!inline_data)
+		ext2fs_block_alloc_stats2(fs, blk, +1);
+	ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
+	drop_refcount = 1;
+
+	/*
 	 * Link the directory into the filesystem hierarchy
 	 */
 	if (name) {
@@ -174,17 +183,16 @@ errcode_t ext2fs_mkdir(ext2_filsys fs, e
 		if (retval)
 			goto cleanup;
 	}
-
-	/*
-	 * Update accounting....
-	 */
-	if (!inline_data)
-		ext2fs_block_alloc_stats2(fs, blk, +1);
-	ext2fs_inode_alloc_stats2(fs, ino, +1, 1);
+	drop_refcount = 0;
 
 cleanup:
 	if (block)
 		ext2fs_free_mem(&block);
+	if (drop_refcount) {
+		if (!inline_data)
+			ext2fs_block_alloc_stats2(fs, blk, -1);
+		ext2fs_inode_alloc_stats2(fs, ino, -1, 1);
+	}
 	return retval;
 
 }
Index: e2fsprogs-1.43.8/lib/ext2fs/symlink.c
===================================================================
--- e2fsprogs-1.43.8.orig/lib/ext2fs/symlink.c
+++ e2fsprogs-1.43.8/lib/ext2fs/symlink.c
@@ -38,6 +38,7 @@ errcode_t ext2fs_symlink(ext2_filsys fs,
 	int			fastlink, inlinelink;
 	unsigned int		target_len;
 	char			*block_buf = 0;
+	int			drop_refcount = 0;
 
 	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
 
@@ -146,6 +147,14 @@ need_block:
 	}
 
 	/*
+	 * Update accounting....
+	 */
+	if (!fastlink && !inlinelink)
+		ext2fs_block_alloc_stats2(fs, blk, +1);
+	ext2fs_inode_alloc_stats2(fs, ino, +1, 0);
+	drop_refcount = 1;
+
+	/*
 	 * Link the symlink into the filesystem hierarchy
 	 */
 	if (name) {
@@ -161,16 +170,15 @@ need_block:
 		if (retval)
 			goto cleanup;
 	}
-
-	/*
-	 * Update accounting....
-	 */
-	if (!fastlink && !inlinelink)
-		ext2fs_block_alloc_stats2(fs, blk, +1);
-	ext2fs_inode_alloc_stats2(fs, ino, +1, 0);
+	drop_refcount = 0;
 
 cleanup:
 	if (block_buf)
 		ext2fs_free_mem(&block_buf);
+	if (drop_refcount) {
+		if (!fastlink && !inlinelink)
+			ext2fs_block_alloc_stats2(fs, blk, -1);
+		ext2fs_inode_alloc_stats2(fs, ino, -1, 0);
+	}
 	return retval;
 }