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block/export: port virtio-blk read/write range check 

Check that the sector number and byte count are valid.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20210223144653.811468-13-stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2021-02-23 14:46:53 +00:00 committed by Kevin Wolf
parent db4eadf9f1
commit 05ae4e674e
1 changed files with 16 additions and 3 deletions
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19
block/export/vhost-user-blk-server.c
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@ -209,6 +209,8 @@ static void coroutine_fn vu_blk_virtio_process_req(void *opaque)
switch (type & ~VIRTIO_BLK_T_BARRIER) {
case VIRTIO_BLK_T_IN:
case VIRTIO_BLK_T_OUT: {
QEMUIOVector qiov;
int64_t offset;
ssize_t ret = 0;
bool is_write = type & VIRTIO_BLK_T_OUT;
req->sector_num = le64_to_cpu(req->out.sector);
@ -218,13 +220,24 @@ static void coroutine_fn vu_blk_virtio_process_req(void *opaque)
break;
}
int64_t offset = req->sector_num << VIRTIO_BLK_SECTOR_BITS;
QEMUIOVector qiov;
if (is_write) {
qemu_iovec_init_external(&qiov, out_iov, out_num);
ret = blk_co_pwritev(blk, offset, qiov.size, &qiov, 0);
} else {
qemu_iovec_init_external(&qiov, in_iov, in_num);
}
if (unlikely(!vu_blk_sect_range_ok(vexp,
req->sector_num,
qiov.size))) {
req->in->status = VIRTIO_BLK_S_IOERR;
break;
}
offset = req->sector_num << VIRTIO_BLK_SECTOR_BITS;
if (is_write) {
ret = blk_co_pwritev(blk, offset, qiov.size, &qiov, 0);
} else {
ret = blk_co_preadv(blk, offset, qiov.size, &qiov, 0);
}
if (ret >= 0) {