From: Daniel P. Berrange Date: Fri, 23 Jun 2017 16:24:03 +0000 (+0100) Subject: qcow: require image size to be > 1 for new images X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6aa837f7bd60903573e0644f503f455454bbf5ae;p=qemu.git qcow: require image size to be > 1 for new images The qcow driver refuses to open images which are less than 2 bytes in size, but will happily create such images. Add a check in the create path to avoid this discrepancy. Reviewed-by: Max Reitz Reviewed-by: Alberto Garcia Reviewed-by: Eric Blake Signed-off-by: Daniel P. Berrange Message-id: 20170623162419.26068-5-berrange@redhat.com Signed-off-by: Max Reitz --- diff --git a/block/qcow.c b/block/qcow.c index 7bd94dcd46..49871fb873 100644 --- a/block/qcow.c +++ b/block/qcow.c @@ -811,6 +811,12 @@ static int qcow_create(const char *filename, QemuOpts *opts, Error **errp) /* Read out options */ total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), BDRV_SECTOR_SIZE); + if (total_size == 0) { + error_setg(errp, "Image size is too small, cannot be zero length"); + ret = -EINVAL; + goto cleanup; + } + backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ENCRYPT, false)) { flags |= BLOCK_FLAG_ENCRYPT;