[Qemu-block] Is the use of bdrv_getlength() in vmdk_check() kosher?

[Markus Armbruster]

Have a look at vmdk_check():

        if (ret == VMDK_OK &&
            cluster_offset >= bdrv_getlength(extent->file->bs))

bdrv_getlength() can fail.  Does it do the right thing then?  For what
it's worth, the comparison of its value is unsigned.