From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58186) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eteJF-0005P3-JE for qemu-devel@nongnu.org; Wed, 07 Mar 2018 14:01:11 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eteJF-0004qT-0n for qemu-devel@nongnu.org; Wed, 07 Mar 2018 14:01:05 -0500 From: Kevin Wolf Date: Wed, 7 Mar 2018 19:59:44 +0100 Message-Id: <20180307185946.29366-36-kwolf@redhat.com> In-Reply-To: <20180307185946.29366-1-kwolf@redhat.com> References: <20180307185946.29366-1-kwolf@redhat.com> Subject: [Qemu-devel] [PATCH v4 35/37] block: Fail bdrv_truncate() with negative size List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-block@nongnu.org Cc: kwolf@redhat.com, mreitz@redhat.com, pkrempa@redhat.com, eblake@redhat.com, jcody@redhat.com, jdurgin@redhat.com, mitake.hitoshi@lab.ntt.co.jp, namei.unix@gmail.com, qemu-devel@nongnu.org Most callers have their own checks, but something like this should also be checked centrally. As it happens, x-blockdev-create can pass negative image sizes to format drivers (because there is no QAPI type that would reject negative numbers) and triggers the check added by this patch. Signed-off-by: Kevin Wolf Reviewed-by: Max Reitz Reviewed-by: Eric Blake --- block.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/block.c b/block.c index 00f94241fc..75a9fd49de 100644 --- a/block.c +++ b/block.c @@ -3719,6 +3719,11 @@ int bdrv_truncate(BdrvChild *child, int64_t offset, PreallocMode prealloc, error_setg(errp, "No medium inserted"); return -ENOMEDIUM; } + if (offset < 0) { + error_setg(errp, "Image size cannot be negative"); + return -EINVAL; + } + if (!drv->bdrv_truncate) { if (bs->file && drv->is_filter) { return bdrv_truncate(bs->file, offset, prealloc, errp); -- 2.13.6