MFC r198705:

Ensure target/lun passed from user-level supported on this bus.
Scanning unsupported IDs causes different issues from duplicate
devices to system crash.

1 files changed, 28 insertions, 1 deletions

diff --git a/sys/cam/cam_xpt.c b/sys/cam/cam_xpt.c
index 479a605..d3ed9aa 100644
--- a/sys/cam/cam_xpt.c
+++ b/sys/cam/cam_xpt.c
@@ -452,7 +452,34 @@ xptioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td
 			ccb = xpt_alloc_ccb();
 
 			CAM_SIM_LOCK(bus->sim);
-
+			/* Ensure passed in target/lun supported on this bus. */
+			if ((inccb->ccb_h.target_id != CAM_TARGET_WILDCARD) ||
+			    (inccb->ccb_h.target_lun != CAM_LUN_WILDCARD)) {
+				if (xpt_create_path(&ccb->ccb_h.path,
+					    xpt_periph,
+					    inccb->ccb_h.path_id,
+					    CAM_TARGET_WILDCARD,
+					    CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
+					error = EINVAL;
+					CAM_SIM_UNLOCK(bus->sim);
+					xpt_free_ccb(ccb);
+					break;
+				}
+				xpt_setup_ccb(&ccb->ccb_h, ccb->ccb_h.path,
+				    inccb->ccb_h.pinfo.priority);
+				ccb->ccb_h.func_code = XPT_PATH_INQ;
+				xpt_action(ccb);
+				xpt_free_path(ccb->ccb_h.path);
+				if ((inccb->ccb_h.target_id != CAM_TARGET_WILDCARD &&
+				    inccb->ccb_h.target_id > ccb->cpi.max_target) ||
+				    (inccb->ccb_h.target_lun != CAM_LUN_WILDCARD &&
+				    inccb->ccb_h.target_lun > ccb->cpi.max_lun)) {
+					error = EINVAL;
+					CAM_SIM_UNLOCK(bus->sim);
+					xpt_free_ccb(ccb);
+					break;
+				}
+			}
 			/*
 			 * Create a path using the bus, target, and lun the
 			 * user passed in.