From 8441d82d51e25c6a7d1ca92cecc42168f20af72a Mon Sep 17 00:00:00 2001 From: Max Reitz Date: Wed, 3 Jul 2019 19:28:04 +0200 Subject: [PATCH] block/stream: Swap backing file change order bdrv_change_backing_file() can result in yields. Therefore, @base may no longer be the the backing_bs() of s->bottom afterwards. Just swap the order of the two calls to fix this. Signed-off-by: Max Reitz Message-id: 20190703172813.6868-4-mreitz@redhat.com Signed-off-by: Max Reitz --- block/stream.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/stream.c b/block/stream.c index b27e61625d..6ac1e7bec4 100644 --- a/block/stream.c +++ b/block/stream.c @@ -78,8 +78,8 @@ static int stream_prepare(Job *job) base_fmt = base->drv->format_name; } } - ret = bdrv_change_backing_file(bs, base_id, base_fmt); bdrv_set_backing_hd(bs, base, &local_err); + ret = bdrv_change_backing_file(bs, base_id, base_fmt); if (local_err) { error_report_err(local_err); return -EPERM;