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10 Mar 2024 20:25:43 -0700 Received: from liuzhao-optiplex-7080.sh.intel.com ([10.239.160.36]) by fmviesa003.fm.intel.com with ESMTP; 10 Mar 2024 20:25:41 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1710127577; x=1741663577; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=IFz0JY+zc2MQkBUXwbMVKVIFtiFvbhCHaahl7QCHiEg=; b=Wvohpi1IgbzQEnt43nT0Zk+AXoO/q6arM3jDYXP7WYlTZAtrPWXsDpAW BQAz5vOMelP7Ax0geOKXhVTCFs97rEX8q+coxaec0n7pF4Qk/RQiaFMId vE+iT/e9zhOD1EGy3Txk30Nj/0/bADwDvo/78pLn19jpAmV2BklmhOxBv dx0d8yU0m5iRDhbuqrF+h/ZmZ61GD9HmPvK3XohqVqaoA8lNCt5lKSKiO CGorHwhSNVFfx4mSGjzPgj7GIC7p3QJYjwan7jTJOYvZWFgY9SYFfclpc SnTExDODQx9mVZ5uKuSkHTQDyJoioupY3WH+5Vea+XPpT6vMCi9JHb4Uk A==; X-IronPort-AV: E=McAfee;i="6600,9927,11009"; a="22229761" X-IronPort-AV: E=Sophos;i="6.07,115,1708416000"; d="scan'208";a="22229761" X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,115,1708416000"; d="scan'208";a="15594019" From: Zhao Liu To: Thomas Huth , 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 , Alex Williamson , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PATCH v2 20/29] hw/vfio/helpers: Fix missing ERRP_GUARD() for error_prepend() Date: Mon, 11 Mar 2024 11:38:13 +0800 Message-Id: <20240311033822.3142585-21-zhao1.liu@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240311033822.3142585-1-zhao1.liu@linux.intel.com> References: <20240311033822.3142585-1-zhao1.liu@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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=198.175.65.10; envelope-from=zhao1.liu@linux.intel.com; helo=mgamail.intel.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.945, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, 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: 1710127632859100005 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 &error_fatal, the user can't see this additional information, because exit() happens in error_setg earlier than information is added [1]. In hw/vfio/helpers.c, there are 3 functions passing @errp to error_prepend() without ERRP_GUARD(): - vfio_set_irq_signaling() - vfio_device_get_name() - vfio_device_set_fd() 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 their @errp with ERRP_GUARD(). To avoid the issue like [1] said, add missing ERRP_GUARD() at their beginning. [1]: Issue description in the commit message of commit ae7c80a7bd73 ("error: New macro ERRP_GUARD()"). Cc: Alex Williamson Cc: "C=C3=A9dric Le Goater" Signed-off-by: Zhao Liu Reviewed-by: C=C3=A9dric Le Goater --- v2: Use Markus' sentence to polish commit message. (Markus) --- hw/vfio/helpers.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/hw/vfio/helpers.c b/hw/vfio/helpers.c index 678987080228..47b4096c05ee 100644 --- a/hw/vfio/helpers.c +++ b/hw/vfio/helpers.c @@ -110,6 +110,7 @@ static const char *index_to_str(VFIODevice *vbasedev, i= nt index) int vfio_set_irq_signaling(VFIODevice *vbasedev, int index, int subindex, int action, int fd, Error **errp) { + ERRP_GUARD(); struct vfio_irq_set *irq_set; int argsz, ret =3D 0; const char *name; @@ -613,6 +614,7 @@ bool vfio_has_region_cap(VFIODevice *vbasedev, int regi= on, uint16_t cap_type) =20 int vfio_device_get_name(VFIODevice *vbasedev, Error **errp) { + ERRP_GUARD(); struct stat st; =20 if (vbasedev->fd < 0) { @@ -644,6 +646,7 @@ int vfio_device_get_name(VFIODevice *vbasedev, Error **= errp) =20 void vfio_device_set_fd(VFIODevice *vbasedev, const char *str, Error **err= p) { + ERRP_GUARD(); int fd =3D monitor_fd_param(monitor_cur(), str, errp); =20 if (fd < 0) { --=20 2.34.1