block/qcow2: zero data_file child after free
data_file being NULL doesn't seem to be a correct state, but it's better than dead pointer and simpler to debug. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20200316060631.30052-3-vsementsov@virtuozzo.com> Reviewed-by: John Snow <jsnow@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
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@ -1758,6 +1758,7 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options,
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g_free(s->image_data_file);
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if (has_data_file(bs)) {
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bdrv_unref_child(bs, s->data_file);
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s->data_file = NULL;
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}
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g_free(s->unknown_header_fields);
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cleanup_unknown_header_ext(bs);
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@ -2621,6 +2622,7 @@ static void qcow2_close(BlockDriverState *bs)
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if (has_data_file(bs)) {
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bdrv_unref_child(bs, s->data_file);
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s->data_file = NULL;
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}
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qcow2_refcount_close(bs);
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