block/vpc: Don't abuse the footer buffer for dynamic header
commita18dc3a14d8455c0b7673f9c3b6cdc4f10a7dade
authorMarkus Armbruster <armbru@redhat.com>
Thu, 17 Dec 2020 16:19:57 +0000 (17 17:19 +0100)
committerKevin Wolf <kwolf@redhat.com>
Fri, 18 Dec 2020 11:43:14 +0000 (18 12:43 +0100)
tree5c277d6d25cad2b807d6b339504791e4547c72a7
parentb0ce8cb0e8470b37963d1db7e4baca9c3647b0a1
block/vpc: Don't abuse the footer buffer for dynamic header

create_dynamic_disk() takes a buffer holding the footer as first
argument.  It writes out the footer (512 bytes), then reuses the
buffer to initialize and write out the dynamic header (1024 bytes).

Works, because the caller passes a buffer that is large enough for
both purposes.  I hate that.

Use a separate buffer for the dynamic header, and adjust the caller's
buffer.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201217162003.1102738-4-armbru@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
block/vpc.c