filesys: Fix corruption and buffer leak on bad input address

diff --git a/Kernel/filesys.c b/Kernel/filesys.c
index 8153c6f..7369117 100644 (file)
--- a/Kernel/filesys.c
+++ b/Kernel/filesys.c
@@ -30,7 +30,9 @@ inoptr n_open(char *uname, inoptr *parent)
 
     if (ugets(uname, tb, 512) == -1) {
         udata.u_error = EFAULT;
-        *parent = NULLINODE;
+        if (parent)
+            *parent = NULLINODE;
+        pathfree(tb);
         return NULLINODE;
     }