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From add89f969fc86f3b3223c4283ee49fcb507b8f81 Mon Sep 17 00:00:00 2001
From: Zhang Shengju <>
Date: Tue, 13 Mar 2012 22:38:13 +0800
Subject: [PATCH] block/vpc: write checksum back to footer after check
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After validation check, the 'checksum' is not written back
to footer, which leave it with zero.

This results in errors while loadding it under Microsoft's
Hyper-V environment, and also errors from utilities like
Citrix's vhd-util.

Signed-off-by: Zhang Shengju <>
Signed-off-by: Kevin Wolf <>
(cherry picked from commit c088b691363070d151f80cc1fde4b7c151bdfe8f)

Signed-off-by: Andreas Färber <>
 block/vpc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/block/vpc.c b/block/vpc.c
index ac33e15..55201e2 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -170,6 +170,9 @@ static int vpc_open(BlockDriverState *bs, int flags)
         fprintf(stderr, "block-vpc: The header checksum of '%s' is "
             "incorrect.\n", bs->filename);
+    /* Write 'checksum' back to footer, or else will leave it with zero. */
+    footer->checksum = be32_to_cpu(checksum);
     // The visible size of a image in Virtual PC depends on the geometry
     // rather than on the size stored in the footer (the size in the footer
     // is too large usually)