From nobody Tue Nov 4 15:26:28 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1530144823814334.5297773733545; Wed, 27 Jun 2018 17:13:43 -0700 (PDT) Received: from localhost ([::1]:33783 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fYKZD-0000EW-0V for importer@patchew.org; Wed, 27 Jun 2018 20:13:43 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57710) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fYKTt-0004cA-11 for qemu-devel@nongnu.org; Wed, 27 Jun 2018 20:08:15 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fYKTp-0003za-Af for qemu-devel@nongnu.org; Wed, 27 Jun 2018 20:08:12 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:41450 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fYKTl-0003sY-9O; Wed, 27 Jun 2018 20:08:05 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id EE24181A4EA9; Thu, 28 Jun 2018 00:08:04 +0000 (UTC) Received: from localhost (unknown [10.40.205.153]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 9A2092026D5B; Thu, 28 Jun 2018 00:08:04 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Date: Thu, 28 Jun 2018 02:07:23 +0200 Message-Id: <20180628000745.4477-10-mreitz@redhat.com> In-Reply-To: <20180628000745.4477-1-mreitz@redhat.com> References: <20180628000745.4477-1-mreitz@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.8]); Thu, 28 Jun 2018 00:08:04 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.8]); Thu, 28 Jun 2018 00:08:04 +0000 (UTC) for IP:'10.11.54.4' DOMAIN:'int-mx04.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'mreitz@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PATCH v9 09/31] block: Make path_combine() return the path X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Besides being safe for arbitrary path lengths, after some follow-up patches all callers will want a freshly allocated buffer anyway. In the meantime, path_combine_deprecated() is added which has the same interface as path_combine() had before this patch. All callers to that function will be converted in follow-up patches. Signed-off-by: Max Reitz Reviewed-by: Alberto Garcia Reviewed-by: Kevin Wolf --- include/block/block.h | 4 +- block.c | 85 ++++++++++++++++++++++++------------------- block/vmdk.c | 3 +- 3 files changed, 49 insertions(+), 43 deletions(-) diff --git a/include/block/block.h b/include/block/block.h index d0a840d7a6..f72ab30408 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -466,9 +466,7 @@ void bdrv_get_full_backing_filename_from_filename(const= char *backed, =20 int path_has_protocol(const char *path); int path_is_absolute(const char *path); -void path_combine(char *dest, int dest_size, - const char *base_path, - const char *filename); +char *path_combine(const char *base_path, const char *filename); =20 int bdrv_readv_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t p= os); int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t = pos); diff --git a/block.c b/block.c index 262b66b00f..be0a8475aa 100644 --- a/block.c +++ b/block.c @@ -152,53 +152,62 @@ int path_is_absolute(const char *path) #endif } =20 -/* if filename is absolute, just copy it to dest. Otherwise, build a +/* if filename is absolute, just return its duplicate. Otherwise, build a path to it by considering it is relative to base_path. URL are supported. */ -void path_combine(char *dest, int dest_size, - const char *base_path, - const char *filename) +char *path_combine(const char *base_path, const char *filename) { + const char *protocol_stripped =3D NULL; const char *p, *p1; + char *result; int len; =20 - if (dest_size <=3D 0) - return; if (path_is_absolute(filename)) { - pstrcpy(dest, dest_size, filename); - } else { - const char *protocol_stripped =3D NULL; + return g_strdup(filename); + } =20 - if (path_has_protocol(base_path)) { - protocol_stripped =3D strchr(base_path, ':'); - if (protocol_stripped) { - protocol_stripped++; - } + if (path_has_protocol(base_path)) { + protocol_stripped =3D strchr(base_path, ':'); + if (protocol_stripped) { + protocol_stripped++; } - p =3D protocol_stripped ?: base_path; + } + p =3D protocol_stripped ?: base_path; =20 - p1 =3D strrchr(base_path, '/'); + p1 =3D strrchr(base_path, '/'); #ifdef _WIN32 - { - const char *p2; - p2 =3D strrchr(base_path, '\\'); - if (!p1 || p2 > p1) - p1 =3D p2; + { + const char *p2; + p2 =3D strrchr(base_path, '\\'); + if (!p1 || p2 > p1) { + p1 =3D p2; } + } #endif - if (p1) - p1++; - else - p1 =3D base_path; - if (p1 > p) - p =3D p1; - len =3D p - base_path; - if (len > dest_size - 1) - len =3D dest_size - 1; - memcpy(dest, base_path, len); - dest[len] =3D '\0'; - pstrcat(dest, dest_size, filename); + if (p1) { + p1++; + } else { + p1 =3D base_path; + } + if (p1 > p) { + p =3D p1; } + len =3D p - base_path; + + result =3D g_malloc(len + strlen(filename) + 1); + memcpy(result, base_path, len); + strcpy(result + len, filename); + + return result; +} + +static void path_combine_deprecated(char *dest, int dest_size, + const char *base_path, + const char *filename) +{ + char *combined =3D path_combine(base_path, filename); + pstrcpy(dest, dest_size, combined); + g_free(combined); } =20 /* @@ -297,7 +306,7 @@ void bdrv_get_full_backing_filename_from_filename(const= char *backed, error_setg(errp, "Cannot use relative backing file names for '%s'", backed); } else { - path_combine(dest, sz, backed, backing); + path_combine_deprecated(dest, sz, backed, backing); } } =20 @@ -4304,8 +4313,8 @@ BlockDriverState *bdrv_find_backing_image(BlockDriver= State *bs, } else { /* If not an absolute filename path, make it relative to the c= urrent * image's filename path */ - path_combine(filename_tmp, PATH_MAX, curr_bs->filename, - backing_file); + path_combine_deprecated(filename_tmp, PATH_MAX, curr_bs->filen= ame, + backing_file); =20 /* We are going to compare absolute pathnames */ if (!realpath(filename_tmp, filename_full)) { @@ -4314,8 +4323,8 @@ BlockDriverState *bdrv_find_backing_image(BlockDriver= State *bs, =20 /* We need to make sure the backing filename we are comparing = against * is relative to the current image filename (or absolute) */ - path_combine(filename_tmp, PATH_MAX, curr_bs->filename, - curr_bs->backing_file); + path_combine_deprecated(filename_tmp, PATH_MAX, curr_bs->filen= ame, + curr_bs->backing_file); =20 if (!realpath(filename_tmp, backing_file_full)) { continue; diff --git a/block/vmdk.c b/block/vmdk.c index 228999eeba..bec4a222e3 100644 --- a/block/vmdk.c +++ b/block/vmdk.c @@ -867,8 +867,7 @@ static int vmdk_parse_extents(const char *desc, BlockDr= iverState *bs, return -EINVAL; } =20 - extent_path =3D g_malloc0(PATH_MAX); - path_combine(extent_path, PATH_MAX, desc_file_path, fname); + extent_path =3D path_combine(desc_file_path, fname); =20 ret =3D snprintf(extent_opt_prefix, 32, "extents.%d", s->num_exten= ts); assert(ret < 32); --=20 2.17.1