From patchwork Tue Mar 12 12:42:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Huth X-Patchwork-Id: 13589902 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0D93BC54E6A for ; Tue, 12 Mar 2024 12:44:50 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rk1Ub-0002n4-FT; Tue, 12 Mar 2024 08:44:29 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rk1UC-0002Ip-Ua for qemu-devel@nongnu.org; Tue, 12 Mar 2024 08:44:05 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rk1U7-000071-MP for qemu-devel@nongnu.org; Tue, 12 Mar 2024 08:44:02 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1710247439; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=eSv1YqeGADcco7ZxgNGLXLtwuD3hZ+ULVdi/S+nqTWA=; b=KRx2Mc3y9BK9p7akUo+KBjhlYgK25IhF7sg+tekYJI0+wmZDXKA+/IUv9uCO+rB6bVByl5 n+Ef2idhDj1RL77W7MYCDAOG5M4M/kDlkKZrJcDvmWJdVeRaFrD/mkP1/ww59rl/XvaB3M mLL5Zv1h+ORecGDlEHmyPRl+T6aw19c= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-306-z04nSDn8M3G3H6wuhKFrag-1; Tue, 12 Mar 2024 08:43:57 -0400 X-MC-Unique: z04nSDn8M3G3H6wuhKFrag-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 61217800274; Tue, 12 Mar 2024 12:43:57 +0000 (UTC) Received: from thuth-p1g4.redhat.com (unknown [10.39.192.69]) by smtp.corp.redhat.com (Postfix) with ESMTP id 76CD8492BD1; Tue, 12 Mar 2024 12:43:55 +0000 (UTC) From: Thomas Huth To: qemu-devel@nongnu.org Cc: Peter Maydell , Zhao Liu , Kevin Wolf , Hanna Reitz , qemu-block@nongnu.org, Eric Blake Subject: [PULL 09/55] block: Fix missing ERRP_GUARD() for error_prepend() Date: Tue, 12 Mar 2024 13:42:53 +0100 Message-ID: <20240312124339.761630-10-thuth@redhat.com> In-Reply-To: <20240312124339.761630-1-thuth@redhat.com> References: <20240312124339.761630-1-thuth@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.10 Received-SPF: pass client-ip=170.10.133.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.687, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Zhao Liu As the comment in qapi/error, passing @errp to error_prepend() requires ERRP_GUARD(): * = Why, when and how to use ERRP_GUARD() = * * Without ERRP_GUARD(), use of the @errp parameter is restricted: ... * - It should not be passed to error_prepend(), error_vprepend() or * error_append_hint(), because that doesn't work with &error_fatal. * ERRP_GUARD() lifts these restrictions. * * To use ERRP_GUARD(), add it right at the beginning of the function. * @errp can then be used without worrying about the argument being * NULL or &error_fatal. ERRP_GUARD() could avoid the case when @errp is &error_fatal, the user can't see this additional information, because exit() happens in error_setg earlier than information is added [1]. In block.c, there are 4 functions passing @errp to error_prepend() without ERRP_GUARD(): - bdrv_co_create_opts_simple() - parse_json_filename() - bdrv_open_backing_file() - bdrv_append_temp_snapshot() bdrv_co_create_opts_simple(), is an implementation of BlockDriver.bdrv_co_create_opts(). There are too many possible callers to check the impact of this defect; it may or may not be harmless. Thus it is necessary to protect @errp with ERRP_GUARD(). Though the @errp parameters passed to parse_json_filename(), bdrv_open_backing_file() and bdrv_append_temp_snapshot() points to their callers' local_err, to follow the requirement of @errp, also add missing ERRP_GUARD() at their beginning. [1]: Issue description in the commit message of commit ae7c80a7bd73 ("error: New macro ERRP_GUARD()"). Cc: Kevin Wolf Cc: Hanna Reitz Cc: qemu-block@nongnu.org Signed-off-by: Zhao Liu Reviewed-by: Eric Blake Message-ID: <20240311033822.3142585-4-zhao1.liu@linux.intel.com> Signed-off-by: Thomas Huth --- block.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/block.c b/block.c index 1ed9214f66..cf66c767a0 100644 --- a/block.c +++ b/block.c @@ -633,6 +633,7 @@ int coroutine_fn bdrv_co_create_opts_simple(BlockDriver *drv, QemuOpts *opts, Error **errp) { + ERRP_GUARD(); BlockBackend *blk; QDict *options; int64_t size = 0; @@ -1998,6 +1999,7 @@ fail_opts: static QDict *parse_json_filename(const char *filename, Error **errp) { + ERRP_GUARD(); QObject *options_obj; QDict *options; int ret; @@ -3585,6 +3587,7 @@ int bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, const char *bdref_key, Error **errp) { + ERRP_GUARD(); char *backing_filename = NULL; char *bdref_key_dot; const char *reference = NULL; @@ -3851,6 +3854,7 @@ static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs, QDict *snapshot_options, Error **errp) { + ERRP_GUARD(); g_autofree char *tmp_filename = NULL; int64_t total_size; QemuOpts *opts = NULL;