From 89dd7d5275136d7d5d1b2288d944b523e65a903c Mon Sep 17 00:00:00 2001
From: Alasdair Kergon <agk@redhat.com>
Date: Thu, 1 Jul 2010 11:04:58 +0000
Subject: [PATCH] Fix lvm shell crash when input is entirely whitespace. 
 (Xinwei Hu)

---
 WHATS_NEW   | 1 +
 tools/lvm.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/WHATS_NEW b/WHATS_NEW
index f5ca1aca1..78a34ad55 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,6 @@
 Version 2.02.70 - 
 ================================
+  Fix lvm shell crash when input is entirely whitespace.
   Update partial mode warning message.
   Preserve memlock balance in clvmd when activation triggers a resume.
 
diff --git a/tools/lvm.c b/tools/lvm.c
index d1c2f9b52..0ca5cee7b 100644
--- a/tools/lvm.c
+++ b/tools/lvm.c
@@ -217,6 +217,9 @@ int lvm_shell(struct cmd_context *cmd, struct cmdline_context *cmdline)
 			continue;
 		}
 
+		if (!argc)
+			continue;
+
 		if (!strcmp(argv[0], "lvm")) {
 			argv++;
 			argc--;