tree 80b0494a575cb32252c9d5a10314df749b2f04b9
parent 24f3078a049c52070adfc659fc3a1a71a11a7765
author Kevin Wolf <kwolf@redhat.com> 1395835531 +0100
committer Stefan Hajnoczi <stefanha@redhat.com> 1396353587 +0200

bochs: Unify header structs and make them QEMU_PACKED

This is an on-disk structure, so offsets must be accurate.

Before this patch, sizeof(bochs) != sizeof(header_v1), which makes the
memcpy() between both invalid. We're lucky enough that the destination
buffer happened to be the larger one, and the memcpy size to be taken
from the smaller one, so we didn't get a buffer overflow in practice.

This patch unifies the both structures, eliminating the need to do a
memcpy in the first place. The common fields are extracted to the top
level of the struct and the actually differing part gets a union of the
two versions.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>