From 17a9dff769f6e7e4733b4cd1932a2b4731bef55b Mon Sep 17 00:00:00 2001
From: Bill Currie <bill@taniwha.org>
Date: Sun, 6 Mar 2011 11:18:19 +0900
Subject: [PATCH] Avoid freeing an operand twice.

Due to the way operands are used, they can be freed twice in dead-statement
removal. Detect the double-free and ignore it.
---
 tools/qfcc/source/statements.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/qfcc/source/statements.c b/tools/qfcc/source/statements.c
index dbf4b88ee..3183d99ce 100644
--- a/tools/qfcc/source/statements.c
+++ b/tools/qfcc/source/statements.c
@@ -182,6 +182,12 @@ new_operand (op_type_e op)
 static void
 free_operand (operand_t *op)
 {
+	if (op->next) {
+		//FIXME this should be an error, but due to the way operands are use,
+		//it can happen.
+		debug (0, "free_operand: double free");
+		return;
+	}
 	op->next = free_operands;
 	free_operands = op;
 }