From 0bb027f032cae1267c7d4210042878a22f107650 Mon Sep 17 00:00:00 2001
From: fachat <fachat@web.de>
Date: Sun, 29 Jul 2012 19:05:02 +0200
Subject: [PATCH] Fix memory pointer bug if index is -1

---
 xa/src/xal.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/xa/src/xal.c b/xa/src/xal.c
index 3d3b32e..6779e98 100644
--- a/xa/src/xal.c
+++ b/xa/src/xal.c
@@ -608,8 +608,10 @@ static int ll_def(char *s, int *n, int b, label_t ltype)
 	ltp->blknext = -1;	// no next block
 	ltp->blkprev = b_link( afile->la.lti );	// previous block, linked within block
 
-	ltp = afile->la.lt + ltp->blkprev;
-	ltp->blknext = afile->la.lti;
+	if (ltp->blkprev != -1) {
+		ltp = afile->la.lt + ltp->blkprev;
+		ltp->blknext = afile->la.lti;
+	}
 
                *n=afile->la.lti;	// return the list index for that file in the out parameter n
                afile->la.lti++;		// increase last index in lable table