diff -uNr tcl8.6.0.orig/generic/tclIOUtil.c tcl8.6.0-1segfaultonnotmp/generic/tclIOUtil.c
--- tcl8.6.0.orig/generic/tclIOUtil.c 2012-10-25 06:43:59.000000000 -0500
+++ tcl8.6.0-1segfaultonnotmp/generic/tclIOUtil.c 2013-05-18 13:23:32.370452500 -0500
@@ -3228,9 +3228,15 @@
*/
copyToPtr = TclpTempFileNameForLibrary(interp, pathPtr);
- Tcl_IncrRefCount(copyToPtr);
- copyFsPtr = Tcl_FSGetFileSystemForPath(copyToPtr);
+ if (copyToPtr != NULL) {
+ Tcl_IncrRefCount(copyToPtr);
+
+ copyFsPtr = Tcl_FSGetFileSystemForPath(copyToPtr);
+ } else {
+ copyFsPtr = NULL;
+ }
+
if ((copyFsPtr == NULL) || (copyFsPtr == fsPtr)) {
/*
* We already know we can't use Tcl_FSLoadFile from this filesystem,