sg_io(): use import_iovec()
... and don't skip access_ok() validation.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index e1f71c3..55b6f15 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -335,16 +335,14 @@
struct iov_iter i;
struct iovec *iov = NULL;
- ret = rw_copy_check_uvector(-1, hdr->dxferp, hdr->iovec_count,
- 0, NULL, &iov);
- if (ret < 0) {
- kfree(iov);
+ ret = import_iovec(rq_data_dir(rq),
+ hdr->dxferp, hdr->iovec_count,
+ 0, &iov, &i);
+ if (ret < 0)
goto out_free_cdb;
- }
/* SG_IO howto says that the shorter of the two wins */
- iov_iter_init(&i, rq_data_dir(rq), iov, hdr->iovec_count,
- min_t(unsigned, ret, hdr->dxfer_len));
+ iov_iter_truncate(&i, hdr->dxfer_len);
ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
kfree(iov);