From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45661) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f0TEb-0003BR-5k for qemu-devel@nongnu.org; Mon, 26 Mar 2018 10:36:30 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1f0TEX-0004Fw-I7 for qemu-devel@nongnu.org; Mon, 26 Mar 2018 10:36:29 -0400 From: Kevin Wolf Date: Mon, 26 Mar 2018 16:35:57 +0200 Message-Id: <20180326143600.7724-17-kwolf@redhat.com> In-Reply-To: <20180326143600.7724-1-kwolf@redhat.com> References: <20180326143600.7724-1-kwolf@redhat.com> Subject: [Qemu-devel] [PULL 16/19] vhdx: Require power-of-two block size on create List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-block@nongnu.org Cc: kwolf@redhat.com, qemu-devel@nongnu.org Images with a non-power-of-two block size are invalid and cannot be opened. Reject such block sizes when creating an image. Signed-off-by: Kevin Wolf Reviewed-by: Eric Blake Reviewed-by: Jeff Cody --- block/vhdx.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/block/vhdx.c b/block/vhdx.c index d2c54b7891..6a5e48eb69 100644 --- a/block/vhdx.c +++ b/block/vhdx.c @@ -1877,6 +1877,10 @@ static int coroutine_fn vhdx_co_create(BlockdevCreateOptions *opts, error_setg_errno(errp, EINVAL, "Block size must be a multiple of 1 MB"); return -EINVAL; } + if (!is_power_of_2(block_size)) { + error_setg(errp, "Block size must be a power of two"); + return -EINVAL; + } if (block_size > VHDX_BLOCK_SIZE_MAX) { error_setg_errno(errp, EINVAL, "Block size must not exceed %d", VHDX_BLOCK_SIZE_MAX); -- 2.13.6