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block/vhdx: check for offset overflow to bdrv_truncate()

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VHDX uses uint64_t types for most offsets, following the VHDX spec.
However, bdrv_truncate() takes an int64_t value for the truncating
offset.  Check for overflow before calling bdrv_truncate().

While we are here, replace the bit shifting with QEMU_ALIGN_UP as well.

N.B.: For a compliant image this is not an issue, as the maximum VHDX
image size is defined per the spec to be 64TB.

Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Jeff Cody 2017-08-07 08:38:20 -04:00 committed by Kevin Wolf
parent 3f910692c2
commit 27539ac531
2 changed files with 8 additions and 1 deletions
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6
block/vhdx-log.c
View file

@ -553,7 +553,11 @@ static int vhdx_log_flush(BlockDriverState *bs, BDRVVHDXState *s,
new_file_size = desc_entries->hdr.last_file_offset;
if (new_file_size % (1024*1024)) {
/* round up to nearest 1MB boundary */
new_file_size = ((new_file_size >> 20) + 1) << 20;
new_file_size = QEMU_ALIGN_UP(new_file_size, MiB);
if (new_file_size > INT64_MAX) {
ret = -EINVAL;
goto exit;
}
bdrv_truncate(bs->file, new_file_size, PREALLOC_MODE_OFF, NULL);
}
}

3
block/vhdx.c
View file

@ -1177,6 +1177,9 @@ static int vhdx_allocate_block(BlockDriverState *bs, BDRVVHDXState *s,
/* per the spec, the address for a block is in units of 1MB */
*new_offset = ROUND_UP(*new_offset, 1024 * 1024);
if (*new_offset > INT64_MAX) {
return -EINVAL;
}
return bdrv_truncate(bs->file, *new_offset + s->block_size,
PREALLOC_MODE_OFF, NULL);