openzfs#15972: Added fix for zpool get segfaults with two or more vdevs.

Signed-off-by: Syed Shahrukh Hussain <[email protected]>

Author: Syed-Shahrukh-OSSRevival

cmd/zpool/zpool_main.c

@@ -12747,11 +12747,13 @@ zpool_do_get(int argc, char **argv)
 
 			if (strcmp(argv[1], "root") == 0)
 				vdev = strdup("root-0");
-			else
-				vdev = strdup(argv[1]);
 
 			/* ... and the rest are vdev names */
-			cb.cb_vdevs.cb_names = &vdev;
+			if (vdev == NULL)
+				cb.cb_vdevs.cb_names = argv + 1;
+			else
+				cb.cb_vdevs.cb_names = &vdev;
+
 			cb.cb_vdevs.cb_names_count = argc - 1;
 			cb.cb_type = ZFS_TYPE_VDEV;
 			argc = 1; /* One pool to process */