clear np->mem after freeing

1 files changed, 1 insertions, 0 deletions

diff --git a/proc.c b/proc.c
index d90b057..3fd35d5 100644
--- a/proc.c
+++ b/proc.c
@@ -107,6 +107,7 @@ copyproc(struct proc* p)
   np->kstack = kalloc(KSTACKSIZE);
   if(np->kstack == 0){
     kfree(np->mem, np->sz);
+    np->mem = 0;
     np->state = UNUSED;
     return 0;
   }