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block/mirror: check backing in bdrv_mirror_top_refresh_filename
Backing may be zero after failed bdrv_attach_child in bdrv_set_backing_hd, which leads to SIGSEGV. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-id: 20170928120300.58164-1-vsementsov@virtuozzo.com Reviewed-by: John Snow <jsnow@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
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@ -1058,6 +1058,11 @@ static int coroutine_fn bdrv_mirror_top_pdiscard(BlockDriverState *bs,
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static void bdrv_mirror_top_refresh_filename(BlockDriverState *bs, QDict *opts)
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{
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if (bs->backing == NULL) {
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/* we can be here after failed bdrv_attach_child in
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* bdrv_set_backing_hd */
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return;
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}
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bdrv_refresh_filename(bs->backing->bs);
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pstrcpy(bs->exact_filename, sizeof(bs->exact_filename),
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bs->backing->bs->filename);
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