1 files changed, 1 insertions, 1 deletions
diff --git a/kalloc.c b/kalloc.c
index 34765c2..4125527 100644
--- a/kalloc.c
+++ b/kalloc.c
@@ -95,7 +95,7 @@ kalloc(int n)
   char *p;
   struct run *r, **rr;
 
-  if(n % PAGE)
+  if(n % PAGE || n <= 0)
     panic("kalloc");
 
   acquire(&kalloc_lock);