[PATCH 4.19 013/421] [xarray] iov_iter_fault_in_readable() should do nothing in xarray case

From: Al Viro viro@zeniv.linux.org.uk

commit 0e8f0d67401589a141950856902c7d0ec8d9c985 upstream.

... and actually should just check it's given an iovec-backed iterator in the first place.

Cc: stable@vger.kernel.org Signed-off-by: Al Viro viro@zeniv.linux.org.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- lib/iov_iter.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -417,7 +417,7 @@ int iov_iter_fault_in_readable(struct io int err; struct iovec v;

- if (!(i->type & (ITER_BVEC|ITER_KVEC))) { + if (iter_is_iovec(i)) { iterate_iovec(i, bytes, v, iov, skip, ({ err = fault_in_pages_readable(v.iov_base, v.iov_len); if (unlikely(err))