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blockdev: fix missed target unref for drive-backup

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If the bitmap can't be used for whatever reason, we skip putting down
the reference. Fix that.

In practice, this means that if you attempt to gracefully exit QEMU
after a backup command being rejected, bdrv_close_all will fail and
tell you some unpleasant things via assert().

Reported-by: aihua liang <aliang@redhat.com>
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1703916
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
John Snow 2019-05-13 11:06:38 -04:00 committed by Kevin Wolf
parent ac6fb43eae
commit 4da26f138d
1 changed files with 6 additions and 7 deletions
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13
blockdev.c
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@ -3546,8 +3546,7 @@ static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
if (set_backing_hd) {
bdrv_set_backing_hd(target_bs, source, &local_err);
if (local_err) {
bdrv_unref(target_bs);
goto out;
goto unref;
}
}
@ -3555,11 +3554,10 @@ static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
if (!bmap) {
error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
bdrv_unref(target_bs);
goto out;
goto unref;
}
if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_DEFAULT, errp)) {
goto out;
goto unref;
}
}
if (!backup->auto_finalize) {
@ -3573,12 +3571,13 @@ static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
backup->sync, bmap, backup->compress,
backup->on_source_error, backup->on_target_error,
job_flags, NULL, NULL, txn, &local_err);
bdrv_unref(target_bs);
if (local_err != NULL) {
error_propagate(errp, local_err);
goto out;
goto unref;
}
unref:
bdrv_unref(target_bs);
out:
aio_context_release(aio_context);
return job;