From e670a4835858b48e1568742dbe939800e2d44c13 Mon Sep 17 00:00:00 2001
From: kolya <kolya>
Date: Wed, 15 Oct 2008 17:42:56 +0000
Subject: [PATCH] as rtm noticed, avoid doubly-freeing pipe page

---
 pipe.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/pipe.c b/pipe.c
index fda3788..8a580f9 100644
--- a/pipe.c
+++ b/pipe.c
@@ -69,10 +69,11 @@ pipeclose(struct pipe *p, int writable)
     p->readopen = 0;
     wakeup(&p->writep);
   }
-  release(&p->lock);
-
-  if(p->readopen == 0 && p->writeopen == 0)
+  if(p->readopen == 0 && p->writeopen == 0) {
+    release(&p->lock);
     kfree((char*)p, PAGE);
+  } else
+    release(&p->lock);
 }
 
 //PAGEBREAK: 30