From 2ca4c92f58f9386e080b26f9ccd78c9ca5825a42 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] dm ioctl: prevent empty message

Detect invalid empty messages in core dm instead of requiring every target to
check this.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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