1 files changed, 4 insertions, 1 deletions
diff --git a/fs.c b/fs.c
index cd60da9..5280a4d 100644
--- a/fs.c
+++ b/fs.c
@@ -262,8 +262,8 @@ iunlink(struct inode *ip)
     if (ip->addrs[i] != 0) {
       if (i == INDIRECT) {
 	inbp = bread(ip->dev, ip->addrs[INDIRECT]);
+        uint *a = (uint *) inbp->data;
 	for (j = 0; j < NINDIRECT; j++) {
-	  uint *a = (uint *) inbp->data;
 	  if (a[j] != 0) {
 	    bfree(ip->dev, a[j]);
 	    a[j] = 0;
@@ -589,6 +589,9 @@ unlink(char *cp)
 
   ip = iget(dev, inum);
 
+  if(ip->nlink < 1)
+    panic("unlink nlink < 1");
+
   ip->nlink--;
 
   iupdate(ip);