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scsi-disk: improve the lba-out-of-range tests for read/write/verify 

Improve the tests for the LBA to cover more cases.

For the 16 byte opcodes, the lba is a uint64, so we need to check is to
make sure that we do not wrap.  For example if an opcode would specify
the LBA:0xffffffffffffffff and LEN:2 then lba+len would wrap to 1.

Also verify that ALL requested blocks are available, not just the first one.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Ronnie Sahlberg 2012-07-12 16:52:47 +10:00 committed by Paolo Bonzini
parent 96bdbbab55
commit ba6095cd6b
1 changed files with 4 additions and 2 deletions
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6
hw/scsi-disk.c
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@ -1777,7 +1777,8 @@ static int32_t scsi_disk_dma_command(SCSIRequest *req, uint8_t *buf)
if (r->req.cmd.buf[1] & 0xe0) {
goto illegal_request;
}
if (r->req.cmd.lba > s->qdev.max_lba) {
if (r->req.cmd.lba > r->req.cmd.lba + len ||
r->req.cmd.lba + len - 1 > s->qdev.max_lba) {
goto illegal_lba;
}
r->sector = r->req.cmd.lba * (s->qdev.blocksize / 512);
@ -1800,7 +1801,8 @@ static int32_t scsi_disk_dma_command(SCSIRequest *req, uint8_t *buf)
if (r->req.cmd.buf[1] & 0xe0) {
goto illegal_request;
}
if (r->req.cmd.lba > s->qdev.max_lba) {
if (r->req.cmd.lba > r->req.cmd.lba + len ||
r->req.cmd.lba + len - 1 > s->qdev.max_lba) {
goto illegal_lba;
}
r->sector = r->req.cmd.lba * (s->qdev.blocksize / 512);