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block/mirror: check backing in bdrv_mirror_top_flush 

Backing may be zero after failed bdrv_append in mirror_start_job,
which leads to SIGSEGV.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20170929152255.5431-1-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
(cherry picked from commit ce960aa906)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2017-09-29 18:22:55 +03:00 committed by Michael Roth
parent b234266086
commit 49958d37e7
1 changed files with 4 additions and 0 deletions
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4
block/mirror.c
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@ -1056,6 +1056,10 @@ static int coroutine_fn bdrv_mirror_top_pwritev(BlockDriverState *bs,
static int coroutine_fn bdrv_mirror_top_flush(BlockDriverState *bs) static int coroutine_fn bdrv_mirror_top_flush(BlockDriverState *bs)
{ {
if (bs->backing == NULL) {
/* we can be here after failed bdrv_append in mirror_start_job */
return 0;
}
return bdrv_co_flush(bs->backing->bs); return bdrv_co_flush(bs->backing->bs);
} }