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raw_bsd: don't check size alignment when only offset is set

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We make sure that the size is aligned to sector length to prevent any
round ups. Otherwise we could end up reading/writing data outside the
area specified by user. This is only needed when user supplies the size
option to avoid any surprises. It is not necessary when only offset is
set.

More over, the check made it difficult to use the offset option without
size option. The check puts unneeded restriction on the offset which had
to be aligned too. Because bdrv_getlength() returns aligned value having
unaligned offset would make the check fail.

Signed-off-by: Tomáš Golembiovský <tgolembi@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Tomáš Golembiovský 2016-11-03 14:47:49 +01:00 committed by Kevin Wolf
parent 40332872fe
commit 80a15e3e2e
1 changed files with 1 additions and 1 deletions
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2
block/raw_bsd.c
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@ -119,7 +119,7 @@ static int raw_read_options(QDict *options, BlockDriverState *bs,
/* Make sure size is multiple of BDRV_SECTOR_SIZE to prevent rounding
* up and leaking out of the specified area. */
if (!QEMU_IS_ALIGNED(s->size, BDRV_SECTOR_SIZE)) {
if (s->has_size && !QEMU_IS_ALIGNED(s->size, BDRV_SECTOR_SIZE)) {
error_setg(errp, "Specified size is not multiple of %llu",
BDRV_SECTOR_SIZE);
ret = -EINVAL;