Fixed buffer overflow

futhark_mpi/dispatch.c

@@ -496,7 +496,7 @@ static envelope_t get_outer_envelope_2d(struct dispatch_context *dc, int thickne
         /* Neighbour send north-east cell, which correspond to south-west cell */
         int dimensions[2] = {thickness, thickness};
         int start_y = dc->chunks_info[dest_source].y;
-        int start_x = dc->chunks_info[dest_source].x + dc->chunk_info[dest_source].dimensions[1] - thickness;
+        int start_x = dc->chunks_info[dest_source].x + dc->chunks_info[dest_source].dimensions[1] - thickness;
         chunk_info_init(&outer_envelope.south_west, dc->type, dimensions, start_y, start_x, true);
         MPI_Irecv(outer_envelope.south_west.data, outer_envelope.south_west.count * dc->type, MPI_UINT8_T, dest_source,
                   NORTH_EAST_CELLS_TAG, MPI_COMM_WORLD, &requests[i_request++]);
@@ -514,8 +514,8 @@ static envelope_t get_outer_envelope_2d(struct dispatch_context *dc, int thickne
 
         /* Neighbour send south-east cell, which correspond to north-west cell */
         int dimensions[2] = {thickness, thickness};
-        int start_y = dc->chunks_info[dest_source].y + dc->chunk_info[dest_source].dimensions[0] - thickness;
-        int start_x = dc->chunks_info[dest_source].x + dc->chunk_info[dest_source].dimensions[1] - thickness;
+        int start_y = dc->chunks_info[dest_source].y + dc->chunks_info[dest_source].dimensions[0] - thickness;
+        int start_x = dc->chunks_info[dest_source].x + dc->chunks_info[dest_source].dimensions[1] - thickness;
         chunk_info_init(&outer_envelope.north_west, dc->type, dimensions, start_y, start_x, true);
         MPI_Irecv(outer_envelope.north_west.data, outer_envelope.north_west.count * dc->type, MPI_INT8_T, dest_source,
                   SOUTH_EAST_CELLS_TAG, MPI_COMM_WORLD, &requests[i_request++]);