ir_to_mesa: Don't dereference a NULL pointer during copy propagation

The ACP may already be NULL, so don't try to make it NULL again.

This should fix bugzilla #34119.

diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index d0ec23f..7f905ae 100644 (file)
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -2754,6 +2754,9 @@ ir_to_mesa_visitor::copy_propagate(void)
             */
            for (int r = 0; r < this->next_temp; r++) {
               for (int c = 0; c < 4; c++) {
+                 if (!acp[4 * r + c])
+                    continue;
+
                  if (acp[4 * r + c]->src_reg[0].file == PROGRAM_OUTPUT)
                     acp[4 * r + c] = NULL;
               }