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Re: [Qemu-block] [PATCH] blockdev: fix missed target unref for drive-bac
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-block] [PATCH] blockdev: fix missed target unref for drive-backup |
Date: |
Mon, 13 May 2019 13:13:21 +0200 |
User-agent: |
Mutt/1.11.3 (2019-02-01) |
Am 10.05.2019 um 23:52 hat John Snow geschrieben:
> 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 <address@hidden>
> Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1703916
> Signed-off-by: John Snow <address@hidden>
> ---
> blockdev.c | 12 +++++-------
> 1 file changed, 5 insertions(+), 7 deletions(-)
>
> diff --git a/blockdev.c b/blockdev.c
> index 79fbac8450..278ecdd122 100644
> --- a/blockdev.c
> +++ b/blockdev.c
> @@ -3525,8 +3525,7 @@ 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;
> }
> }
>
> @@ -3534,11 +3533,10 @@ 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) {
> @@ -3552,12 +3550,12 @@ 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;
Please leave a 'goto unref' here so we can later add more code without
modifying unrelated error paths (or, more likely, forgetting to modify
them).
> }
>
> +unref:
> + bdrv_unref(target_bs);
> out:
> aio_context_release(aio_context);
> return job;
With this fixed:
Reviewed-by: Kevin Wolf <address@hidden>