lpfc: Fix driver crash when module parameter lpfc_fcp_io_channel set to 16

BugLink: http://bugs.launchpad.net/bugs/1541592

Fix driver crash when module parameter lpfc_fcp_io_channel set to 16
Signed-off-by: Dick Kennedy <dick.kennedy@avagotech.com>
Signed-off-by: James Smart <james.smart@avagotech.com>
Reviewed-by: Hannes Reinicke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit 6690e0d4)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

drivers/scsi/lpfc/lpfc_init.c

@@ -8833,9 +8833,12 @@ lpfc_sli4_set_affinity(struct lpfc_hba *phba, int vectors)
 				 * already mapped to this phys_id.
 				 */
 				if (cpup->irq != LPFC_VECTOR_MAP_EMPTY) {
-					chann[saved_chann] =
-						cpup->channel_id;
-					saved_chann++;
+					if (saved_chann <=
+					    LPFC_FCP_IO_CHAN_MAX) {
+						chann[saved_chann] =
+							cpup->channel_id;
+						saved_chann++;
+					}
 					goto out;
 				}