validate cursor relative addressing

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@856 57a11ea4-9604-0410-9ed3-97b8803252fd

src/register/table-gtk.c

@@ -175,7 +175,14 @@ verify_cell_interaction_OK(Table *table, const int row, const int col)
   /* compute the cell location */
   rel_row = table->locators[row][col]->phys_row_offset;
   rel_col = table->locators[row][col]->phys_col_offset;
-  
+
+  /* verify that cursor offsets are valid.  This may occur if 
+   * the app that is using the table has a paritally initialized
+   * cursor. (probably due to a prograing error, but maybe they 
+   * meant to do this). */
+  invalid = invalid || (0 > rel_row);
+  invalid = invalid || (0 > rel_col);
+
   /* check for a cell handler, but only if cell adress is valid */
   /* GTK may not need all these checks, but they don't hurt */
   if (arr && !invalid) {

src/register/table-motif.c

@@ -172,6 +172,13 @@ cellCB (Widget mw, XtPointer cd, XtPointer cb)
    rel_row = table->locators[row][col]->phys_row_offset;
    rel_col = table->locators[row][col]->phys_col_offset;
 
+  /* verify that cursor offsets are valid.  This may occur if
+   * the app that is using the table has a paritally initialized
+   * cursor. (probably due to a prograing error, but maybe they
+   * meant to do this). */
+   invalid = invalid || (0 > rel_row);
+   invalid = invalid || (0 > rel_col);
+
    /* check for a cell handler, but only if cell adress is valid */
    if (arr && !invalid) {
       if (! (arr->cells[rel_row][rel_col])) {