commit c4e8918cd248189d43cdc8df9f9f0450040261c5
author Eric Anholt <eric@anholt.net> Fri Nov 20 21:42:06 2009 +0100
committer Eric Anholt <eric@anholt.net> Fri Nov 20 21:46:48 2009 +0100
tree 1c4a1894408e6a18ef90717a11be6134d8c19ff6
parent 48deddaa6f81e58f0ad6ab1c6cbd31c0184a0a3b

mesa: Fix NULL deref in optimizer when NumInstructions == 0.

Bug #24984.

src/mesa/shader/prog_optimize.c

diff --git a/src/mesa/shader/prog_optimize.c b/src/mesa/shader/prog_optimize.c
index 3d28d88..4fe3512 100644
--- a/src/mesa/shader/prog_optimize.c
+++ b/src/mesa/shader/prog_optimize.c
@@ -443,7 +443,7 @@
     *    FOO tmpY, arg0, arg1;
     */
 
-   for (i = 0; i < prog->NumInstructions - 1; i++) {
+   for (i = 0; i + 1 < prog->NumInstructions; i++) {
       const struct prog_instruction *mov = prog->Instructions + i;
 
       if (mov->Opcode != OPCODE_MOV ||