Backing file loop should be checked before calling change_backing_
file(). If loop appeared, this calling should be stopped and an
error was printed.
Signed-off-by: Xu Wang <cngesa...@gmail.com>
---
block.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/block.c b/block.c
index e9b9112..bd8240c 100644
--- a/block.c
+++ b/block.c
@@ -1967,6 +1967,13 @@ int bdrv_change_backing_file(BlockDriverState *bs,
return -EINVAL;
}
+ /* Check if loop exists in backing files chain after changed */
+ if (bdrv_backing_file_loop_check(bs->filename,
+ bs->drv ? bs->drv->format_name : NULL,
+ 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
