From: Ian Romanick <ian.d.romanick@intel.com>
Date: Fri, 11 Feb 2011 23:19:05 +0000 (-0800)
Subject: ir_to_mesa: Don't dereference a NULL pointer during copy propagation
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3803295fc2b9c517e80aa46f2338308e23e64e4a;p=mesa.git

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 d0ec23fc857..7f905ae5ce3 100644
--- 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;
 	       }