Backing file loop should be checked before calling change_backing_
file(). If loop appeared, this calling should be stopped and an
error printed.
Signed-off-by: Xu Wang <gesa...@linux.vnet.ibm.com>
---
block.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/block.c b/block.c
index 8423e80..cb50bfd 100644
--- a/block.c
+++ b/block.c
@@ -2083,6 +2083,11 @@ int bdrv_change_backing_file(BlockDriverState *bs,
return -EINVAL;
}
+ /* Check if loop exists in backing files chain after change */
+ if (!bdrv_new_chain_okay(bs->filename, backing_file, backing_fmt)) {
+ return -EIO;
+ }
+
if (drv->bdrv_change_backing_file != NULL) {
ret = drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
} else {
--
1.8.1.4
