Commit f2a09af6 authored by Yongqiang Yang's avatar Yongqiang Yang Committed by Theodore Ts'o

ext4: check free inode count before allocating an inode

Recently, I ecountered some corrupted filesystems in which some
groups' free inode counts were 65535, it seemed that free inode
count was overflow.  This patch teaches ext4 to check free inode
count before allocaing an inode.
Signed-off-by: default avatarYongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 838cd0cf
...@@ -697,6 +697,15 @@ struct inode *ext4_new_inode(handle_t *handle, struct inode *dir, umode_t mode, ...@@ -697,6 +697,15 @@ struct inode *ext4_new_inode(handle_t *handle, struct inode *dir, umode_t mode,
if (!gdp) if (!gdp)
goto fail; goto fail;
/*
* Check free inodes count before loading bitmap.
*/
if (ext4_free_inodes_count(sb, gdp) == 0) {
if (++group == ngroups)
group = 0;
continue;
}
brelse(inode_bitmap_bh); brelse(inode_bitmap_bh);
inode_bitmap_bh = ext4_read_inode_bitmap(sb, group); inode_bitmap_bh = ext4_read_inode_bitmap(sb, group);
if (!inode_bitmap_bh) if (!inode_bitmap_bh)
......
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