diff mbox series

[v3,4/4] ext4: fix inode leak in 'ext4_xattr_inode_create()'

Message ID 20221208023233.1231330-5-yebin@huaweicloud.com
State Accepted
Headers show
Series Fix two issue about ext4 extended attribute | expand

Commit Message

Ye Bin Dec. 8, 2022, 2:32 a.m. UTC 
From: Ye Bin <yebin10@huawei.com>

There is issue as follows when do setxattr with inject fault:
[localhost]#fsck.ext4  -fn  /dev/sda
e2fsck 1.46.6-rc1 (12-Sep-2022)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Unattached zero-length inode 15.  Clear? no

Unattached inode 15
Connect to /lost+found? no

Pass 5: Checking group summary information

/dev/sda: ********** WARNING: Filesystem still has errors **********

/dev/sda: 15/655360 files (0.0% non-contiguous), 66755/2621440 blocks

This occurs in 'ext4_xattr_inode_create()'. If 'ext4_mark_inode_dirty()'
fails, dropping i_nlink of the inode is needed. Or will lead to inode leak.

Signed-off-by: Ye Bin <yebin10@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
---
 fs/ext4/xattr.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Theodore Ts'o Dec. 9, 2022, 5:39 a.m. UTC | #1 
On Thu, Dec 08, 2022 at 10:32:33AM +0800, Ye Bin wrote:
> From: Ye Bin <yebin10@huawei.com>
> 
> There is issue as follows when do setxattr with inject fault:
> [localhost]#fsck.ext4  -fn  /dev/sda
> e2fsck 1.46.6-rc1 (12-Sep-2022)
> Pass 1: Checking inodes, blocks, and sizes
> Pass 2: Checking directory structure
> Pass 3: Checking directory connectivity
> Pass 4: Checking reference counts
> Unattached zero-length inode 15.  Clear? no
> 
> Unattached inode 15
> Connect to /lost+found? no
> 
> Pass 5: Checking group summary information
> 
> /dev/sda: ********** WARNING: Filesystem still has errors **********
> 
> /dev/sda: 15/655360 files (0.0% non-contiguous), 66755/2621440 blocks
> 
> This occurs in 'ext4_xattr_inode_create()'. If 'ext4_mark_inode_dirty()'
> fails, dropping i_nlink of the inode is needed. Or will lead to inode leak.
> 
> Signed-off-by: Ye Bin <yebin10@huawei.com>
> Reviewed-by: Jan Kara <jack@suse.cz>

Applied, thanks.

					- Ted
diff mbox series

Patch

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 99dacb0393fa..aad7de2e366a 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -1442,6 +1442,9 @@  static struct inode *ext4_xattr_inode_create(handle_t *handle,
 		if (!err)
 			err = ext4_inode_attach_jinode(ea_inode);
 		if (err) {
+			if (ext4_xattr_inode_dec_ref(handle, ea_inode))
+				ext4_warning_inode(ea_inode,
+					"cleanup dec ref error %d", err);
 			iput(ea_inode);
 			return ERR_PTR(err);
 		}