From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33093) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dORNy-0003EW-Pu for qemu-devel@nongnu.org; Fri, 23 Jun 2017 12:24:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dORNx-0000mb-UL for qemu-devel@nongnu.org; Fri, 23 Jun 2017 12:24:42 -0400 From: "Daniel P. Berrange" Date: Fri, 23 Jun 2017 17:24:03 +0100 Message-Id: <20170623162419.26068-5-berrange@redhat.com> In-Reply-To: <20170623162419.26068-1-berrange@redhat.com> References: <20170623162419.26068-1-berrange@redhat.com> Subject: [Qemu-devel] [PATCH v10 04/20] qcow: require image size to be > 1 for new images List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: qemu-block@nongnu.org, Eric Blake , Max Reitz , Kevin Wolf , Alberto Garcia , "Daniel P. Berrange" 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 --- block/qcow.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/block/qcow.c b/block/qcow.c index 7bd94dc..49871fb 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; -- 2.9.3