[RFC PATCH 2/3] xen: teach KASAN about grant tables

[Sergey Dyasli]

From: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>

Otherwise it produces lots of false positives.

Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
---
 drivers/xen/grant-table.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 49b381e104ef..0f844c14d5b9 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -1049,6 +1049,7 @@ int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
 			foreign = xen_page_foreign(pages[i]);
 			foreign->domid = map_ops[i].dom;
 			foreign->gref = map_ops[i].ref;
+			kasan_alloc_pages(pages[i], 0);
 			break;
 		}
 
@@ -1085,8 +1086,10 @@ int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
 	if (ret)
 		return ret;
 
-	for (i = 0; i < count; i++)
+	for (i = 0; i < count; i++) {
 		ClearPageForeign(pages[i]);
+		kasan_free_pages(pages[i], 0);
+	}
 
 	return clear_foreign_p2m_mapping(unmap_ops, kunmap_ops, pages, count);
 }
-- 
2.17.1