fix iget() bug that allocated in-use inode[] entries

1 files changed, 2 insertions, 1 deletions

diff --git a/syscall.c b/syscall.c
index 71a7013..5cfc20b 100644
--- a/syscall.c
+++ b/syscall.c
@@ -284,7 +284,8 @@ sys_mknod(void)
     return -1;
 
   nip = mknod (cp->mem + arg0, (short) arg1, (short) arg2, (short) arg3);
-  iput(nip);
+  if(nip)
+    iput(nip);
   return (nip == 0) ? -1 : 0;
 }