MDEV-12705 10.1.18-MariaDB-1~jessie - mysqld got signal 11.

        Space for the next operation wasn't reserved in
        Item_func_spatial_relate::val_str()

mysql-test/r/gis-precise.result

@@ -486,6 +486,25 @@ ST_Touches(ST_PolygonFromText('POLYGON((0 0,0 5,5 5,5 0,0 0))'),ST_PointFromText
 select ST_Touches(ST_PointFromText('POINT(0 0)'),ST_PointFromText('POINT(0 0)'));
 ST_Touches(ST_PointFromText('POINT(0 0)'),ST_PointFromText('POINT(0 0)'))
 0
+SELECT ST_RELATE(
+ST_DIFFERENCE(
+GEOMETRYFROMTEXT('
+        MULTILINESTRING(
+          ( 12841 36140, 8005 31007, 26555 31075, 52765 41191,
+            28978 6548, 45720 32057, 53345 3221 ),
+          ( 8304 59107, 25233 31592, 40502 25303, 8205 42940 ),
+          ( 7829 7305, 58841 56759, 64115 8512, 37562 54145, 2210 14701 ),
+          ( 20379 2805, 40807 27770, 28147 14883, 26439 29383, 55663 5086 ),
+          ( 35944 64702, 14433 23728, 49317 26241, 790 16941 )
+          )
+        '),
+GEOMETRYFROMTEXT('POINT(46061 13545)')
+),
+GEOMETRYFROMTEXT('POINT(4599 60359)'),
+'F*FFFF**F'
+    ) as relate_res;
+relate_res
+0
 DROP TABLE IF EXISTS p1;
 CREATE PROCEDURE p1(dist DOUBLE, geom TEXT)
 BEGIN

mysql-test/t/gis-precise.test

@@ -362,5 +362,24 @@ select ST_Touches(ST_LineFromText('LINESTRING(0 0,5 5)'),ST_PointFromText('POINT
 select ST_Touches(ST_PolygonFromText('POLYGON((0 0,0 5,5 5,5 0,0 0))'),ST_PointFromText('POINT(0 0)'));
 select ST_Touches(ST_PointFromText('POINT(0 0)'),ST_PointFromText('POINT(0 0)'));
 
+# MDEV-12705 10.1.18-MariaDB-1~jessie - mysqld got signal 11.
+SELECT ST_RELATE(
+    ST_DIFFERENCE(
+      GEOMETRYFROMTEXT('
+        MULTILINESTRING(
+          ( 12841 36140, 8005 31007, 26555 31075, 52765 41191,
+            28978 6548, 45720 32057, 53345 3221 ),
+          ( 8304 59107, 25233 31592, 40502 25303, 8205 42940 ),
+          ( 7829 7305, 58841 56759, 64115 8512, 37562 54145, 2210 14701 ),
+          ( 20379 2805, 40807 27770, 28147 14883, 26439 29383, 55663 5086 ),
+          ( 35944 64702, 14433 23728, 49317 26241, 790 16941 )
+          )
+        '),
+      GEOMETRYFROMTEXT('POINT(46061 13545)')
+      ),
+    GEOMETRYFROMTEXT('POINT(4599 60359)'),
+    'F*FFFF**F'
+    ) as relate_res;
+
 --source include/gis_debug.inc
 

sql/item_geofunc.cc

@@ -1332,6 +1332,8 @@ static int setup_relate_func(Geometry *g1, Geometry *g2,
     }
     else
       func->repeat_expression(shape_a);
+    if (func->reserve_op_buffer(1))
+      return 1;
     func->add_operation(op_matrix(nc%3), 1);
     if (do_store_shapes)
     {
@@ -1502,11 +1504,13 @@ longlong Item_func_spatial_precise_rel::val_int()
                          Gcalc_function::op_intersection, 2);
       func.add_operation(Gcalc_function::op_internals, 1);
       shape_a= func.get_next_expression_pos();
-      if ((null_value= g1.store_shapes(&trn)))
+      if ((null_value= g1.store_shapes(&trn)) ||
+          func.reserve_op_buffer(1))
         break;
       func.add_operation(Gcalc_function::op_internals, 1);
       shape_b= func.get_next_expression_pos();
-      if ((null_value= g2.store_shapes(&trn)))
+      if ((null_value= g2.store_shapes(&trn)) ||
+          func.reserve_op_buffer(1))
         break;
       func.add_operation(Gcalc_function::v_find_t |
                          Gcalc_function::op_intersection, 2);
@@ -1741,6 +1745,8 @@ int Item_func_buffer::Transporter::single_point(double x, double y)
 {
   if (buffer_op == Gcalc_function::op_difference)
   {
+    if (m_fn->reserve_op_buffer(1))
+      return 1;
     m_fn->add_operation(Gcalc_function::op_false, 0);
     return 0;
   }