LU-13437 lmv: check stripe FID sanity

Striped directory layout may be broken, if some stripe FID is insane,
return -ENODEV.

Lustre-change: https://review.whamcloud.com/38560
Lustre-commit: 698a496a

Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: I7ed8c7c561e34625e2cb29bfd14bc0ecf3fce46c
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Hongchao Zhang <hongchao@whamcloud.com>
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/39600

Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>

lustre/lmv/lmv_obd.c

@@ -1596,6 +1596,9 @@ __lmv_locate_tgt(struct lmv_obd *lmv, struct lmv_stripe_md *lsm,
 		*fid = oinfo->lmo_fid;
 	if (mds != NULL)
 		*mds = oinfo->lmo_mds;
+	/* check stripe FID is sane */
+	if (!fid_is_sane(&oinfo->lmo_fid))
+		return ERR_PTR(-ENODEV);
 
 	tgt = lmv_get_target(lmv, oinfo->lmo_mds, NULL);