From 3759a4a94519febb36517dc7d723ff7c735c493a Mon Sep 17 00:00:00 2001
From: aiju <aiju@phicode.de>
Date: Sat, 11 Aug 2012 10:40:48 +0000
Subject: [PATCH] disallow walk on open chans

---
 sys/src/cmd/hjfs/fs2.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sys/src/cmd/hjfs/fs2.c b/sys/src/cmd/hjfs/fs2.c
index ee1bc4e01..3d32a1430 100644
--- a/sys/src/cmd/hjfs/fs2.c
+++ b/sys/src/cmd/hjfs/fs2.c
@@ -43,6 +43,11 @@ chanwalk(Chan *ch, char *name)
 	if(name == nil || name[0] == 0 || name[0] == '.' && name[1] == 0)
 		return 1;
 	chbegin(ch);
+  if(ch->open != 0){
+    werrstr(Einval);
+    chend(ch);
+    return -1;
+  }
 	b = getbuf(ch->fs->d, ch->loc->blk, TDENTRY, 0);
 	if(b == nil){
 		chend(ch);