[PATCH 4.14 219/229] ext4: avoid remove directory when directory is corrupted

From: Greg Kroah-Hartman
Date: Tue Aug 23 2022 - 06:27:34 EST


From: Ye Bin <yebin10@xxxxxxxxxx>

[ Upstream commit b24e77ef1c6d4dbf42749ad4903c97539cc9755a ]

Now if check directoy entry is corrupted, ext4_empty_dir may return true
then directory will be removed when file system mounted with "errors=continue".
In order not to make things worse just return false when directory is corrupted.

Signed-off-by: Ye Bin <yebin10@xxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Link: https://lore.kernel.org/r/20220622090223.682234-1-yebin10@xxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/ext4/namei.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 4b78fa4dbcc1..e1cade9dbd30 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2820,11 +2820,8 @@ bool ext4_empty_dir(struct inode *inode)
de = (struct ext4_dir_entry_2 *) (bh->b_data +
(offset & (sb->s_blocksize - 1)));
if (ext4_check_dir_entry(inode, NULL, de, bh,
- bh->b_data, bh->b_size, offset)) {
- offset = (offset | (sb->s_blocksize - 1)) + 1;
- continue;
- }
- if (le32_to_cpu(de->inode)) {
+ bh->b_data, bh->b_size, offset) ||
+ le32_to_cpu(de->inode)) {
brelse(bh);
return false;
}
--
2.35.1