From 57aa40808e83e746a0f759e850ef3ad0218fafb0 Mon Sep 17 00:00:00 2001
From: Alasdair G Kergon <agk@redhat.com>
Date: Tue, 2 Aug 2011 12:32:03 +0100
Subject: [PATCH] --- yaml --- r: 262195 b: refs/heads/master c:
 2ca4c92f58f9386e080b26f9ccd78c9ca5825a42 h: refs/heads/master i:   262193:
 4308279867bf7ec81ac39b8cdaae520a35ab40ee   262191:
 195994d23fe26437db047f2ef048b21dbc67f70e v: v3

---
 [refs]                      | 2 +-
 trunk/drivers/md/dm-ioctl.c | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index a6557ffcbe45..9d0cc1712ca4 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 13c87583ea4e867211fc3e7edab750c353c47c95
+refs/heads/master: 2ca4c92f58f9386e080b26f9ccd78c9ca5825a42
diff --git a/trunk/drivers/md/dm-ioctl.c b/trunk/drivers/md/dm-ioctl.c
index 4cacdad2270a..1622a6bc0bfd 100644
--- a/trunk/drivers/md/dm-ioctl.c
+++ b/trunk/drivers/md/dm-ioctl.c
@@ -1402,6 +1402,11 @@ static int target_message(struct dm_ioctl *param, size_t param_size)
 		goto out;
 	}
 
+	if (!argc) {
+		DMWARN("Empty message received.");
+		goto out;
+	}
+
 	table = dm_get_live_table(md);
 	if (!table)
 		goto out_argv;