[patch] ipset 2.3.0 segfault on '-U :all: {:all:|:default:}

[Tom Eastep <teastep@xxxxxxxxxxxxx>]

Segfault occurs at line 1641 as a result of dereferencing a null pointer 
while testing the set type for iptreemap.

Patch attached.

Disclaimer: I didn't research the consequences of this patch if there are 
existing iptreemap sets.

-Tom
--
Tom Eastep    \ Nothing is foolproof to a sufficiently talented fool
Shoreline,     \ http://shorewall.net
Washington USA  \ teastep@xxxxxxxxxxxxx
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--- ipset.c~	2007-08-27 23:53:14.000000000 -0700
+++ ipset.c	2008-05-29 13:10:02.000000000 -0700
@@ -1638,7 +1638,7 @@
 	DP("(%s, %s) -> %s", set ? set->name : IPSET_TOKEN_ALL, adt, binding);
 
 	/* Ugly */
-	if (strcmp(set->settype->typename, "iptreemap") == 0)
+	if (set && strcmp(set->settype->typename, "iptreemap") == 0)
 		exit_error(PARAMETER_PROBLEM,
 			"iptreemap type of sets cannot be used at binding operations\n");
 	/* Alloc memory for the data to send */

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