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block/stream: Swap backing file change order

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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 <mreitz@redhat.com>
Message-id: 20190703172813.6868-4-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2019-07-03 19:28:04 +02:00
parent 17a7c39248
commit 8441d82d51
1 changed files with 1 additions and 1 deletions
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2
block/stream.c
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@ -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;