From: Darrick J. Wong <djwong@xxxxxxxxxx> Compare the fsid of a handle to m_fixedfsid so that we don't try to open a handle from the wrong fs and get lucky if the ino/gen happen to match. Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx> --- fs/xfs/xfs_handle.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/xfs/xfs_handle.c b/fs/xfs/xfs_handle.c index b9f4d9860682a..417e4a1f5e6cb 100644 --- a/fs/xfs/xfs_handle.c +++ b/fs/xfs/xfs_handle.c @@ -163,6 +163,7 @@ xfs_khandle_to_dentry( .ino = handle->ha_fid.fid_ino, .gen = handle->ha_fid.fid_gen, }; + struct xfs_mount *mp = XFS_I(file_inode(file))->i_mount; /* * Only allow handle opens under a directory. @@ -170,6 +171,9 @@ xfs_khandle_to_dentry( if (!S_ISDIR(file_inode(file)->i_mode)) return ERR_PTR(-ENOTDIR); + if (memcmp(&handle->ha_fsid, mp->m_fixedfsid, sizeof(struct xfs_fsid))) + return ERR_PTR(-ESTALE); + if (handle->ha_fid.fid_len != xfs_filehandle_fid_len()) return ERR_PTR(-EINVAL);
