block/vpc: write checksum back to footer after check

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 <sean_zhang@trendmicro.com.cn>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

diff --git a/block/vpc.c b/block/vpc.c
index 706faf3f384d13c485ebfcf11b68ec4bf6b312fe..5cd13d17a11efd31a6753c30daee514a776e25fe 100644 (file)
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -189,6 +189,9 @@ 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)