From 58515791c8e55bf546d15634a8caef7f41cf3d26 Mon Sep 17 00:00:00 2001
From: dgp <dgp@users.sourceforge.net>
Date: Tue, 24 Jul 2012 20:18:35 +0000
Subject: Preserve the chanPtr so that script evaluation cannot invalidate it
 when we plan to use it again.

---
 generic/tclIO.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/generic/tclIO.c b/generic/tclIO.c
index a1d5447..b9cd30c 100644
--- a/generic/tclIO.c
+++ b/generic/tclIO.c
@@ -7540,6 +7540,7 @@ TclChannelEventScriptInvoker(clientData, mask)
      */
     
     Tcl_Preserve((ClientData) interp);
+    Tcl_Preserve((ClientData) chanPtr);
     result = Tcl_EvalObjEx(interp, esPtr->scriptPtr, TCL_EVAL_GLOBAL);
 
     /*
@@ -7556,6 +7557,7 @@ TclChannelEventScriptInvoker(clientData, mask)
 	}
         Tcl_BackgroundError(interp);
     }
+    Tcl_Release((ClientData) chanPtr);
     Tcl_Release((ClientData) interp);
 }
 
-- 
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