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28 Feb 2024 08:23:59 -0800 Received: from liuzhao-optiplex-7080.sh.intel.com ([10.239.160.36]) by orviesa004.jf.intel.com with ESMTP; 28 Feb 2024 08:23:56 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1709137441; x=1740673441; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=QAn6+MUVu1rKDjC913XhAj1KDjxffFbQY2JrVSnn4uQ=; b=J2BXMY4zkd24SHTTypzlbokPBK/XgrcXHDW2ggDo0ymVwav/Z7J5ZARe SESpbsLDjNRQ3oHDcVQTkYKhckKFBWhkz2dAA1Sm0Hp7uvoha8VL7eQn6 hwh97oPDUhYF9WxijwIRGlnms+Whp8qOTj/iCqHpI7O25XFSnevOzO6Zd PWG0z9NT5RMCvviXW/5DJl7L/HR4lbX/OAqYdtZmgxQAG2eu6sVdmGRQ9 prDcweQtM0qPwc9LLOktI/sVwXsT0JH2bA3dvIhZ0yZ1sxljdcYb1Fp1I sjIux3d8pXB4HPSHKo6I+qmj5komN+jeSXB25n0ugUv9zyAnMhJuKn/y2 w==; X-IronPort-AV: E=McAfee;i="6600,9927,10998"; a="28982446" X-IronPort-AV: E=Sophos;i="6.06,190,1705392000"; d="scan'208";a="28982446" X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.06,190,1705392000"; d="scan'208";a="12144897" From: Zhao Liu To: Markus Armbruster , Michael Roth , Michael Tokarev , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , qemu-devel@nongnu.org Cc: qemu-trivial@nongnu.org, Zhao Liu , John Snow , Vladimir Sementsov-Ogievskiy , Kevin Wolf , Hanna Reitz Subject: [PATCH 04/16] block/cbw: Fix missing ERRP_GUARD() for error_prepend() Date: Thu, 29 Feb 2024 00:37:11 +0800 Message-Id: <20240228163723.1775791-5-zhao1.liu@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240228163723.1775791-1-zhao1.liu@linux.intel.com> References: <20240228163723.1775791-1-zhao1.liu@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=192.198.163.7; envelope-from=zhao1.liu@linux.intel.com; helo=mgamail.intel.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.102, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_NONE=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1709137697081100003 Content-Type: text/plain; charset="utf-8" From: Zhao Liu As the comment in qapi/error, passing @errp to error_prepend() requires ERRP_GUARD(): * =3D Why, when and how to use ERRP_GUARD() =3D * * 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 the pointer of error_fatal, the user can't see this additional information, because exit() happens in error_setg earlier than information is added [1]. The cbw_open() passes @errp to error_prepend() without ERRP_GUARD(). Though it is the BlockDriver.bdrv_open() method, and currently its @errp parameter only points to callers' local_err, to follow the requirement of @errp, add missing ERRP_GUARD() at the beginning of this function. [1]: Issue description in the commit message of commit ae7c80a7bd73 ("error: New macro ERRP_GUARD()"). Cc: John Snow Cc: Vladimir Sementsov-Ogievskiy Cc: Kevin Wolf Cc: Hanna Reitz Signed-off-by: Zhao Liu Reviewed-by: Vladimir Sementsov-Ogievskiy --- block/copy-before-write.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/copy-before-write.c b/block/copy-before-write.c index 0842a1a6dfbe..8aba27a71d6d 100644 --- a/block/copy-before-write.c +++ b/block/copy-before-write.c @@ -407,6 +407,7 @@ out: static int cbw_open(BlockDriverState *bs, QDict *options, int flags, Error **errp) { + ERRP_GUARD(); BDRVCopyBeforeWriteState *s =3D bs->opaque; BdrvDirtyBitmap *bitmap =3D NULL; int64_t cluster_size; --=20 2.34.1