File xen.tapdisk_vbd_open_level.patch of Package xen

From: Olaf Hering <olaf@aepfle.de>
Date: Mon, 15 Jun 2020 23:39:28 +0200
Subject: tapdisk_vbd_open_level

tapdisk-vbd.c: In function '__tapdisk_vbd_open_vdi':
tapdisk-vbd.c:374:4: error: array subscript -9 is outside array bounds of 'struct list_head[1]' [-Werror=array-bounds]
  374 |    td_close(image);
      |    ^~~~~~~~~~~~~~~
In file included from tapdisk.h:62,
                 from tapdisk-image.h:31,
                 from tapdisk-vbd.c:41:
tapdisk-vbd.c:401:13: note: while referencing 'images'
  401 |   LIST_HEAD(images);
      |             ^~~~~~
../include/list.h:32:26: note: in definition of macro 'LIST_HEAD'
   32 |         struct list_head name = LIST_HEAD_INIT(name)
      |                          ^~~~
tapdisk-vbd.c:375:4: error: array subscript -9 is outside array bounds of 'struct list_head[1]' [-Werror=array-bounds]
  375 |    tapdisk_image_free(image);
      |    ^~~~~~~~~~~~~~~~~~~~~~~~~
In file included from tapdisk.h:62,
                 from tapdisk-image.h:31,
                 from tapdisk-vbd.c:41:
tapdisk-vbd.c:401:13: note: while referencing 'images'
  401 |   LIST_HEAD(images);
      |             ^~~~~~
../include/list.h:32:26: note: in definition of macro 'LIST_HEAD'
   32 |         struct list_head name = LIST_HEAD_INIT(name)
      |                          ^~~~

Signed-off-by: Olaf Hering <olaf@aepfle.de>
---
 tools/blktap2/drivers/tapdisk-vbd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/blktap2/drivers/tapdisk-vbd.c
+++ b/tools/blktap2/drivers/tapdisk-vbd.c
@@ -361,25 +361,25 @@ tapdisk_vbd_open_level(td_vbd_t *vbd, struct list_head *head,
 		type   = id.drivertype;
 
 		flags |= (TD_OPEN_RDONLY | TD_OPEN_SHAREABLE);
 	}
 
 out:
 	if (err) {
 		if (image) {
 			td_close(image);
 			tapdisk_image_free(image);
 		}
 		while (!list_empty(head)) {
-			image = list_entry(&head->next, td_image_t, next);
+			image = list_entry(head->next, td_image_t, next);
 			td_close(image);
 			tapdisk_image_free(image);
 		}
 	}
 
 	return err;
 }
 
 static int
 __tapdisk_vbd_open_vdi(td_vbd_t *vbd, td_flag_t extra_flags)
 {
 	int err;