[PATCH 4.19 019/421] ext4: cleanup in-core orphan list if ext4_truncate() failed to get a transaction handle

Greg Kroah-Hartman
2021-07-19T15:46:32Z

From: Zhang Yi <yi.zhang@huawei.com>

commit b9a037b7f3c401d3c63e0423e56aef606b1ffaaf upstream.

In ext4_orphan_cleanup(), if ext4_truncate() failed to get a transaction
handle, it didn't remove the inode from the in-core orphan list, which
may probably trigger below error dump in ext4_destroy_inode() during the
final iput() and could lead to memory corruption on the later orphan
list changes.

EXT4-fs (sda): Inode 6291467 (00000000b8247c67): orphan list check failed!
00000000b8247c67: 0001f30a 00000004 00000000 00000023 ............#...
00000000e24cde71: 00000006 014082a3 00000000 00000000 ......@.........
0000000072c6a5ee: 00000000 00000000 00000000 00000000 ................
...

This patch fix this by cleanup in-core orphan list manually if
ext4_truncate() return error.

Cc: stable@kernel.org
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20210507071904.160808-1-yi.zhang@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/ext4/super.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2689,8 +2689,15 @@ static void ext4_orphan_cleanup(struct s
inode_lock(inode);
truncate_inode_pages(inode->i_mapping, inode->i_size);
ret = ext4_truncate(inode);
- if (ret)
+ if (ret) {
+ /*
+ * We need to clean up the in-core orphan list
+ * manually if ext4_truncate() failed to get a
+ * transaction handle.
+ */
+ ext4_orphan_del(NULL, inode);
ext4_std_error(inode->i_sb, ret);
+ }
inode_unlock(inode);
nr_truncates++;
} else {