block: Fail if requested driver is not available
If an explicit driver option is present, but doesn't specify a valid
driver, then bdrv_open() should fail instead of probing the format.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/block.c b/block.c
index 38078f7..382ea71 100644
--- a/block.c
+++ b/block.c
@@ -1137,6 +1137,11 @@
if (drvname) {
drv = bdrv_find_format(drvname);
qdict_del(options, "driver");
+ if (!drv) {
+ error_setg(errp, "Invalid driver: '%s'", drvname);
+ ret = -EINVAL;
+ goto unlink_and_fail;
+ }
}
if (!drv) {
