1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/kalloc.c b/kernel/kalloc.c
index afadb02..d72e0ab 100644
--- a/kernel/kalloc.c
+++ b/kernel/kalloc.c
@@ -55,8 +55,9 @@ kfree(void *pa)
   // Fill with junk to catch dangling refs.
   memset(pa, 1, PGSIZE);
 
-  acquire(&kmem.lock);
   r = (struct run*)pa;
+
+  acquire(&kmem.lock);
   r->next = kmem.freelist;
   kmem.freelist = r;
   release(&kmem.lock);
@@ -75,6 +76,7 @@ kalloc(void)
   if(r)
     kmem.freelist = r->next;
   release(&kmem.lock);
+
   if(r)
     memset((char*)r, 5, PGSIZE); // fill with junk
   return (void*)r;