linux-ext4 - [PATCH -next 6/6] ext4: fix inode leak in 'ext4_xattr_inode

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Message-Id: <20221206015806.3420321-7-yebin@huaweicloud.com>
Date:   Tue,  6 Dec 2022 09:58:06 +0800
From:   Ye Bin <yebin@...weicloud.com>
To:     tytso@....edu, adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, jack@...e.cz,
        Ye Bin <yebin10@...wei.com>
Subject: [PATCH -next 6/6] ext4: fix inode leak in 'ext4_xattr_inode_create()'

From: Ye Bin <yebin10@...wei.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

Above issue occur in 'ext4_xattr_inode_create()', if 'ext4_mark_inode_dirty()'
failed need to drop inode's i_nlink. Or will lead to inode leak.

Signed-off-by: Ye Bin <yebin10@...wei.com>
---
 fs/ext4/xattr.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 003fe1f2d6a8..734f787ae7ed 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -1464,6 +1464,9 @@ 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);
 		}
-- 
2.31.1