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

Greg Kroah-Hartman
2021-07-19T15:52:57Z

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))