D43145.diff
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	diff --git a/sys/dev/xen/gntdev/gntdev.c b/sys/dev/xen/gntdev/gntdev.c
	--- a/sys/dev/xen/gntdev/gntdev.c
	+++ b/sys/dev/xen/gntdev/gntdev.c
	@@ -383,6 +383,13 @@
	}
	}

	+ /* Copy the output values. */
	+ arg->index = file_offset;
	+ for (i = 0; error == 0 && i < arg->count; i++) {
	+ if (suword32(&arg->gref_ids[i], grefs[i].gref_id) != 0)
	+ error = EFAULT;
	+ }
	+
	if (error != 0) {
	/*
	* If target domain maps the gref (by guessing the gref-id),
	@@ -401,11 +408,6 @@
	return (error);
	}

	- /* Copy the output values. */
	- arg->index = file_offset;
	- for (i = 0; i < arg->count; i++)
	- suword32(&arg->gref_ids[i], grefs[i].gref_id);
	-
	/* Modify the per user private data. */
	mtx_lock(&priv_user->user_data_lock);
	for (i = 0; i < arg->count; i++)