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xfs: introduce protection for drop nlink

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When abnormal drop_nlink are detected on the inode,
return error, to avoid corruption propagation.

Signed-off-by: Cheng Lin <cheng.lin130@zte.com.cn>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
This commit is contained in:
Cheng Lin 2023-10-10 10:09:01 +08:00 committed by Chandan Babu R
parent 9fa8753aa1
commit 2b99e410b2
1 changed files with 7 additions and 0 deletions
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7
fs/xfs/xfs_inode.c
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@ -918,6 +918,13 @@ xfs_droplink(
xfs_trans_t *tp,
xfs_inode_t *ip)
{
if (VFS_I(ip)->i_nlink == 0) {
xfs_alert(ip->i_mount,
"%s: Attempt to drop inode (%llu) with nlink zero.",
__func__, ip->i_ino);
return -EFSCORRUPTED;
}
xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
drop_nlink(VFS_I(ip));