fix bug

CCXXXI · Jan 10, 2021 · b5252b8 · b5252b8
1 parent 14a7248
commit b5252b8
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/userprog/syscall.c b/src/userprog/syscall.c
@@ -270,6 +270,7 @@ static pid_t exec(const char *cmd_line)
 
     if (child->status == PROCESS_FAILED)
     {
+        sema_down(&child->sema_wait);
         palloc_free_page(child);
         return -1;
     }