diff options
| author | Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | 2017-09-29 18:22:55 +0300 |
|---|---|---|
| committer | Max Reitz <mreitz@redhat.com> | 2017-10-06 16:30:48 +0200 |
| commit | ce960aa9062a407d0ca15aee3dcd3bd84a4e24f9 (patch) | |
| tree | 1ba071735ea70c9095cd9ab33d6b8a32f21585f7 | |
| parent | 163bc39d2c2921430e5c23f4d0a0966d62f67a02 (diff) | |
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>
| -rw-r--r-- | block/mirror.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/block/mirror.c b/block/mirror.c index 3b6f0c5772..153758ca9f 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -1041,6 +1041,10 @@ static int coroutine_fn bdrv_mirror_top_pwritev(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); } |