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bh=MXTE73Qf40PfPxoDzgyk1MV10WFjaEhopvA6yEEFtDg=; b=IJxyvpNrt6li9KTR9ZQWbbVuvk9hQQEKiwowFuQO1iQeB3Dojsd5uK1bilW+tfpr6senmG UbrhkpCNsyeDOVKYAW+cjM6zN3n6qgehy4TayRUh+sp0r0CUCp3KjLR68vnYO8ufSQJ57d mJE/kPIkfLtjwYZ8SUQxtSkaYsyCWRg= X-MC-Unique: 2k-TKOI1N0uM7F6HKpPTeg-1 From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PATCH 06/46] error: Avoid error_propagate() when error is not used here Date: Wed, 24 Jun 2020 18:43:04 +0200 Message-Id: <20200624164344.3778251-7-armbru@redhat.com> In-Reply-To: <20200624164344.3778251-1-armbru@redhat.com> References: <20200624164344.3778251-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=armbru@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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: pass client-ip=207.211.31.81; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/24 01:59:40 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, 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_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, vsementsov@virtuozzo.com, berrange@redhat.com, ehabkost@redhat.com, qemu-block@nongnu.org, pbonzini@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" When all we do with an Error we receive into a local variable is propagating to somewhere else, we can just as well receive it there right away. Coccinelle script: @@ identifier fun, err, errp; expression list args; @@ - fun(args, &err); + fun(args, errp); ... when !=3D err when strict - error_propagate(errp, err); @@ identifier fun, err, errp; expression list args; expression ret; @@ - ret =3D fun(args, &err); + ret =3D fun(args, errp); ... when !=3D err when strict - error_propagate(errp, err); @@ identifier fun, err, errp; expression list args; expression ret; @@ - ret =3D fun(args, &err); + ret =3D fun(args, errp); ... when !=3D err when strict if ( ( ret | !ret | ret =3D=3D 0 | ret !=3D 0 | ret < 0 | ret !=3D NULL | ret =3D=3D NULL ) ) { ... when !=3D err when strict - error_propagate(errp, err); ... } @@ identifier fun, err, errp; expression list args; @@ if ( ( - fun(args, &err) + fun(args, errp) | - !fun(args, &err) + !fun(args, errp) | - fun(args, &err) =3D=3D 0 + fun(args, errp) =3D=3D 0 | - fun(args, &err) !=3D 0 + fun(args, errp) !=3D 0 | - fun(args, &err) < 0 + fun(args, errp) < 0 | - fun(args, &err) =3D=3D NULL + fun(args, errp) =3D=3D NULL | - fun(args, &err) !=3D NULL + fun(args, errp) !=3D NULL ) ) { ... when !=3D err; when strict - error_propagate(errp, err); ... } The first two rules are prone to fail with "error_propagate(...) ... reachable by inconsistent control-flow paths". Script without them re-run where that happens. Manually double-check @err is not used afterwards. Dereferencing it would be use after free, but checking whether it's null would be legitimate. One such change to qbus_realize() backed out. Suboptimal line breaks tweaked manually. Signed-off-by: Markus Armbruster Reviewed-by: Eric Blake Reviewed-by: Vladimir Sementsov-Ogievskiy --- backends/cryptodev-vhost-user.c | 3 +-- block.c | 3 +-- block/file-posix.c | 8 ++------ block/parallels.c | 3 +-- block/qcow.c | 3 +-- block/qcow2.c | 10 +++------- block/qed.c | 3 +-- block/replication.c | 4 +--- block/vhdx.c | 3 +-- block/vmdk.c | 7 ++----- block/vpc.c | 3 +-- blockdev.c | 10 +++------- dump/dump.c | 7 ++----- hw/intc/xics_kvm.c | 3 +-- hw/s390x/s390-pci-bus.c | 4 +--- hw/usb/bus.c | 4 +--- hw/vfio/pci.c | 10 +++------- iothread.c | 3 +-- qdev-monitor.c | 3 +-- qga/commands-win32.c | 3 +-- util/main-loop.c | 4 +--- util/qemu-option.c | 3 +-- 22 files changed, 31 insertions(+), 73 deletions(-) diff --git a/backends/cryptodev-vhost-user.c b/backends/cryptodev-vhost-use= r.c index 8b8cbc4223..dbe5a8aae6 100644 --- a/backends/cryptodev-vhost-user.c +++ b/backends/cryptodev-vhost-user.c @@ -209,8 +209,7 @@ static void cryptodev_vhost_user_init( backend->conf.peers.ccs[i] =3D cc; =20 if (i =3D=3D 0) { - if (!qemu_chr_fe_init(&s->chr, chr, &local_err)) { - error_propagate(errp, local_err); + if (!qemu_chr_fe_init(&s->chr, chr, errp)) { return; } } diff --git a/block.c b/block.c index 6dbcb7e083..30a72bc4c2 100644 --- a/block.c +++ b/block.c @@ -5680,10 +5680,9 @@ static void coroutine_fn bdrv_co_invalidate_cache(Bl= ockDriverState *bs, if (bs->open_flags & BDRV_O_INACTIVE) { bs->open_flags &=3D ~BDRV_O_INACTIVE; bdrv_get_cumulative_perm(bs, &perm, &shared_perm); - ret =3D bdrv_check_perm(bs, NULL, perm, shared_perm, NULL, NULL, &= local_err); + ret =3D bdrv_check_perm(bs, NULL, perm, shared_perm, NULL, NULL, e= rrp); if (ret < 0) { bs->open_flags |=3D BDRV_O_INACTIVE; - error_propagate(errp, local_err); return; } bdrv_set_perm(bs, perm, shared_perm); diff --git a/block/file-posix.c b/block/file-posix.c index 3ab8f5a0fa..2294bf5d00 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -3336,7 +3336,6 @@ static int hdev_open(BlockDriverState *bs, QDict *opt= ions, int flags, Error **errp) { BDRVRawState *s =3D bs->opaque; - Error *local_err =3D NULL; int ret; =20 #if defined(__APPLE__) && defined(__MACH__) @@ -3401,9 +3400,8 @@ hdev_open_Mac_error: =20 s->type =3D FTYPE_FILE; =20 - ret =3D raw_open_common(bs, options, flags, 0, true, &local_err); + ret =3D raw_open_common(bs, options, flags, 0, true, errp); if (ret < 0) { - error_propagate(errp, local_err); #if defined(__APPLE__) && defined(__MACH__) if (*bsd_path) { filename =3D bsd_path; @@ -3679,14 +3677,12 @@ static int cdrom_open(BlockDriverState *bs, QDict *= options, int flags, Error **errp) { BDRVRawState *s =3D bs->opaque; - Error *local_err =3D NULL; int ret; =20 s->type =3D FTYPE_CD; =20 - ret =3D raw_open_common(bs, options, flags, 0, true, &local_err); + ret =3D raw_open_common(bs, options, flags, 0, true, errp); if (ret) { - error_propagate(errp, local_err); return ret; } =20 diff --git a/block/parallels.c b/block/parallels.c index 63a1cde8af..a84ec6a518 100644 --- a/block/parallels.c +++ b/block/parallels.c @@ -646,9 +646,8 @@ static int coroutine_fn parallels_co_create_opts(BlockD= river *drv, } =20 /* Create and open the file (protocol layer) */ - ret =3D bdrv_create_file(filename, opts, &local_err); + ret =3D bdrv_create_file(filename, opts, errp); if (ret < 0) { - error_propagate(errp, local_err); goto done; } =20 diff --git a/block/qcow.c b/block/qcow.c index ee5d35fe20..dca2a1fe7d 100644 --- a/block/qcow.c +++ b/block/qcow.c @@ -973,9 +973,8 @@ static int coroutine_fn qcow_co_create_opts(BlockDriver= *drv, } =20 /* Create and open the file (protocol layer) */ - ret =3D bdrv_create_file(filename, opts, &local_err); + ret =3D bdrv_create_file(filename, opts, errp); if (ret < 0) { - error_propagate(errp, local_err); goto fail; } =20 diff --git a/block/qcow2.c b/block/qcow2.c index 0cd2e6757e..e81c284319 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -1583,8 +1583,7 @@ static int coroutine_fn qcow2_do_open(BlockDriverStat= e *bs, QDict *options, =20 /* read qcow2 extensions */ if (qcow2_read_extensions(bs, header.header_length, ext_end, NULL, - flags, &update_header, &local_err)) { - error_propagate(errp, local_err); + flags, &update_header, errp)) { ret =3D -EINVAL; goto fail; } @@ -3356,7 +3355,6 @@ qcow2_co_create(BlockdevCreateOptions *create_options= , Error **errp) int version; int refcount_order; uint64_t* refcount_table; - Error *local_err =3D NULL; int ret; uint8_t compression_type =3D QCOW2_COMPRESSION_TYPE_ZLIB; =20 @@ -3582,9 +3580,8 @@ qcow2_co_create(BlockdevCreateOptions *create_options= , Error **errp) } blk =3D blk_new_open(NULL, NULL, options, BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_NO_FLUSH, - &local_err); + errp); if (blk =3D=3D NULL) { - error_propagate(errp, local_err); ret =3D -EIO; goto out; } @@ -3664,9 +3661,8 @@ qcow2_co_create(BlockdevCreateOptions *create_options= , Error **errp) } blk =3D blk_new_open(NULL, NULL, options, BDRV_O_RDWR | BDRV_O_NO_BACKING | BDRV_O_NO_IO, - &local_err); + errp); if (blk =3D=3D NULL) { - error_propagate(errp, local_err); ret =3D -EIO; goto out; } diff --git a/block/qed.c b/block/qed.c index c0c65015c7..e369fd360a 100644 --- a/block/qed.c +++ b/block/qed.c @@ -749,9 +749,8 @@ static int coroutine_fn bdrv_qed_co_create_opts(BlockDr= iver *drv, } =20 /* Create and open the file (protocol layer) */ - ret =3D bdrv_create_file(filename, opts, &local_err); + ret =3D bdrv_create_file(filename, opts, errp); if (ret < 0) { - error_propagate(errp, local_err); goto fail; } =20 diff --git a/block/replication.c b/block/replication.c index ccf7b78160..aa7164dbe3 100644 --- a/block/replication.c +++ b/block/replication.c @@ -369,7 +369,6 @@ static void reopen_backing_file(BlockDriverState *bs, b= ool writable, { BDRVReplicationState *s =3D bs->opaque; BlockReopenQueue *reopen_queue =3D NULL; - Error *local_err =3D NULL; =20 if (writable) { s->orig_hidden_read_only =3D bdrv_is_read_only(s->hidden_disk->bs); @@ -394,8 +393,7 @@ static void reopen_backing_file(BlockDriverState *bs, b= ool writable, } =20 if (reopen_queue) { - bdrv_reopen_multiple(reopen_queue, &local_err); - error_propagate(errp, local_err); + bdrv_reopen_multiple(reopen_queue, errp); } =20 bdrv_subtree_drained_end(s->hidden_disk->bs); diff --git a/block/vhdx.c b/block/vhdx.c index fa9e544a5e..ac5a9094c4 100644 --- a/block/vhdx.c +++ b/block/vhdx.c @@ -2086,9 +2086,8 @@ static int coroutine_fn vhdx_co_create_opts(BlockDriv= er *drv, } =20 /* Create and open the file (protocol layer) */ - ret =3D bdrv_create_file(filename, opts, &local_err); + ret =3D bdrv_create_file(filename, opts, errp); if (ret < 0) { - error_propagate(errp, local_err); goto fail; } =20 diff --git a/block/vmdk.c b/block/vmdk.c index 62da465126..9a09193f3b 100644 --- a/block/vmdk.c +++ b/block/vmdk.c @@ -2250,19 +2250,16 @@ static int vmdk_create_extent(const char *filename,= int64_t filesize, { int ret; BlockBackend *blk =3D NULL; - Error *local_err =3D NULL; =20 - ret =3D bdrv_create_file(filename, opts, &local_err); + ret =3D bdrv_create_file(filename, opts, errp); if (ret < 0) { - error_propagate(errp, local_err); goto exit; } =20 blk =3D blk_new_open(filename, NULL, NULL, BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, - &local_err); + errp); if (blk =3D=3D NULL) { - error_propagate(errp, local_err); ret =3D -EIO; goto exit; } diff --git a/block/vpc.c b/block/vpc.c index c055591641..36412f764d 100644 --- a/block/vpc.c +++ b/block/vpc.c @@ -1115,9 +1115,8 @@ static int coroutine_fn vpc_co_create_opts(BlockDrive= r *drv, } =20 /* Create and open the file (protocol layer) */ - ret =3D bdrv_create_file(filename, opts, &local_err); + ret =3D bdrv_create_file(filename, opts, errp); if (ret < 0) { - error_propagate(errp, local_err); goto fail; } =20 diff --git a/blockdev.c b/blockdev.c index 31d5eaf6bf..b66863c42a 100644 --- a/blockdev.c +++ b/blockdev.c @@ -3147,9 +3147,8 @@ void qmp_drive_mirror(DriveMirror *arg, Error **errp) arg->has_copy_mode, arg->copy_mode, arg->has_auto_finalize, arg->auto_finalize, arg->has_auto_dismiss, arg->auto_dismiss, - &local_err); + errp); bdrv_unref(target_bs); - error_propagate(errp, local_err); out: aio_context_release(aio_context); } @@ -3177,7 +3176,6 @@ void qmp_blockdev_mirror(bool has_job_id, const char = *job_id, AioContext *aio_context; AioContext *old_context; BlockMirrorBackingMode backing_mode =3D MIRROR_LEAVE_BACKING_CHAIN; - Error *local_err =3D NULL; bool zero_target; int ret; =20 @@ -3219,8 +3217,7 @@ void qmp_blockdev_mirror(bool has_job_id, const char = *job_id, has_copy_mode, copy_mode, has_auto_finalize, auto_finalize, has_auto_dismiss, auto_dismiss, - &local_err); - error_propagate(errp, local_err); + errp); out: aio_context_release(aio_context); } @@ -3439,8 +3436,7 @@ void qmp_change_backing_file(const char *device, } =20 if (ro) { - bdrv_reopen_set_read_only(image_bs, true, &local_err); - error_propagate(errp, local_err); + bdrv_reopen_set_read_only(image_bs, true, errp); } =20 out: diff --git a/dump/dump.c b/dump/dump.c index 248ea06370..383bc7876b 100644 --- a/dump/dump.c +++ b/dump/dump.c @@ -1031,14 +1031,11 @@ out: =20 static void write_dump_header(DumpState *s, Error **errp) { - Error *local_err =3D NULL; - if (s->dump_info.d_class =3D=3D ELFCLASS32) { - create_header32(s, &local_err); + create_header32(s, errp); } else { - create_header64(s, &local_err); + create_header64(s, errp); } - error_propagate(errp, local_err); } =20 static size_t dump_bitmap_get_bufsize(DumpState *s) diff --git a/hw/intc/xics_kvm.c b/hw/intc/xics_kvm.c index 8d6156578f..6705220380 100644 --- a/hw/intc/xics_kvm.c +++ b/hw/intc/xics_kvm.c @@ -316,9 +316,8 @@ int ics_set_kvm_state(ICSState *ics, Error **errp) continue; } =20 - ret =3D ics_set_kvm_state_one(ics, i, &local_err); + ret =3D ics_set_kvm_state_one(ics, i, errp); if (ret < 0) { - error_propagate(errp, local_err); return ret; } } diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c index 0517901024..be8535304e 100644 --- a/hw/s390x/s390-pci-bus.c +++ b/hw/s390x/s390-pci-bus.c @@ -741,7 +741,6 @@ static void s390_pcihost_realize(DeviceState *dev, Erro= r **errp) BusState *bus; PCIHostState *phb =3D PCI_HOST_BRIDGE(dev); S390pciState *s =3D S390_PCI_HOST_BRIDGE(dev); - Error *local_err =3D NULL; =20 DPRINTF("host_init\n"); =20 @@ -765,8 +764,7 @@ static void s390_pcihost_realize(DeviceState *dev, Erro= r **errp) QTAILQ_INIT(&s->zpci_devs); =20 css_register_io_adapters(CSS_IO_ADAPTER_PCI, true, false, - S390_ADAPTER_SUPPRESSIBLE, &local_err); - error_propagate(errp, local_err); + S390_ADAPTER_SUPPRESSIBLE, errp); } =20 static int s390_pci_msix_init(S390PCIBusDevice *pbdev) diff --git a/hw/usb/bus.c b/hw/usb/bus.c index ba27afe9f2..b17bda3b29 100644 --- a/hw/usb/bus.c +++ b/hw/usb/bus.c @@ -723,15 +723,13 @@ static bool usb_get_attached(Object *obj, Error **err= p) static void usb_set_attached(Object *obj, bool value, Error **errp) { USBDevice *dev =3D USB_DEVICE(obj); - Error *err =3D NULL; =20 if (dev->attached =3D=3D value) { return; } =20 if (value) { - usb_device_attach(dev, &err); - error_propagate(errp, err); + usb_device_attach(dev, errp); } else { usb_device_detach(dev); } diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 6838bcc4b3..fb51fc9f6e 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -116,7 +116,6 @@ static void vfio_intx_enable_kvm(VFIOPCIDevice *vdev, E= rror **errp) { #ifdef CONFIG_KVM int irq_fd =3D event_notifier_get_fd(&vdev->intx.interrupt); - Error *err =3D NULL; =20 if (vdev->no_kvm_intx || !kvm_irqfds_enabled() || vdev->intx.route.mode !=3D PCI_INTX_ENABLED || @@ -147,8 +146,7 @@ static void vfio_intx_enable_kvm(VFIOPCIDevice *vdev, E= rror **errp) if (vfio_set_irq_signaling(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX, 0, VFIO_IRQ_SET_ACTION_UNMASK, event_notifier_get_fd(&vdev->intx.unmask), - &err)) { - error_propagate(errp, err); + errp)) { goto fail_vfio; } =20 @@ -294,8 +292,7 @@ static int vfio_intx_enable(VFIOPCIDevice *vdev, Error = **errp) qemu_set_fd_handler(fd, vfio_intx_interrupt, NULL, vdev); =20 if (vfio_set_irq_signaling(&vdev->vbasedev, VFIO_PCI_INTX_IRQ_INDEX, 0, - VFIO_IRQ_SET_ACTION_TRIGGER, fd, &err)) { - error_propagate(errp, err); + VFIO_IRQ_SET_ACTION_TRIGGER, fd, errp)) { qemu_set_fd_handler(fd, NULL, NULL, vdev); event_notifier_cleanup(&vdev->intx.interrupt); return -errno; @@ -2741,9 +2738,8 @@ static void vfio_realize(PCIDevice *pdev, Error **err= p) if (!pdev->failover_pair_id) { error_setg(&vdev->migration_blocker, "VFIO device doesn't support migration"); - ret =3D migrate_add_blocker(vdev->migration_blocker, &err); + ret =3D migrate_add_blocker(vdev->migration_blocker, errp); if (ret) { - error_propagate(errp, err); error_free(vdev->migration_blocker); vdev->migration_blocker =3D NULL; return; diff --git a/iothread.c b/iothread.c index cb082b9b26..6f7ac976de 100644 --- a/iothread.c +++ b/iothread.c @@ -169,9 +169,8 @@ static void iothread_complete(UserCreatable *obj, Error= **errp) =20 iothread->stopping =3D false; iothread->running =3D true; - iothread->ctx =3D aio_context_new(&local_error); + iothread->ctx =3D aio_context_new(errp); if (!iothread->ctx) { - error_propagate(errp, local_error); return; } =20 diff --git a/qdev-monitor.c b/qdev-monitor.c index 13a13a811a..e38030429b 100644 --- a/qdev-monitor.c +++ b/qdev-monitor.c @@ -808,9 +808,8 @@ void qmp_device_add(QDict *qdict, QObject **ret_data, E= rror **errp) qemu_opts_del(opts); return; } - dev =3D qdev_device_add(opts, &local_err); + dev =3D qdev_device_add(opts, errp); if (!dev) { - error_propagate(errp, local_err); qemu_opts_del(opts); return; } diff --git a/qga/commands-win32.c b/qga/commands-win32.c index 5ba56327dd..49dd792d2c 100644 --- a/qga/commands-win32.c +++ b/qga/commands-win32.c @@ -2202,9 +2202,8 @@ GuestOSInfo *qmp_guest_get_osinfo(Error **errp) } =20 server =3D os_version.wProductType !=3D VER_NT_WORKSTATION; - product_name =3D ga_get_win_product_name(&local_err); + product_name =3D ga_get_win_product_name(errp); if (product_name =3D=3D NULL) { - error_propagate(errp, local_err); return NULL; } =20 diff --git a/util/main-loop.c b/util/main-loop.c index eda63fe4e0..f69f055013 100644 --- a/util/main-loop.c +++ b/util/main-loop.c @@ -148,7 +148,6 @@ int qemu_init_main_loop(Error **errp) { int ret; GSource *src; - Error *local_error =3D NULL; =20 init_clocks(qemu_timer_notify_cb); =20 @@ -157,9 +156,8 @@ int qemu_init_main_loop(Error **errp) return ret; } =20 - qemu_aio_context =3D aio_context_new(&local_error); + qemu_aio_context =3D aio_context_new(errp); if (!qemu_aio_context) { - error_propagate(errp, local_error); return -EMFILE; } qemu_notify_bh =3D qemu_bh_new(notify_event_cb, NULL); diff --git a/util/qemu-option.c b/util/qemu-option.c index 0ebfd97a98..fd667ea523 100644 --- a/util/qemu-option.c +++ b/util/qemu-option.c @@ -899,10 +899,9 @@ static QemuOpts *opts_parse(QemuOptsList *list, const = char *params, * (if unlikely) future misuse: */ assert(!defaults || list->merge_lists); - opts =3D qemu_opts_create(list, id, !defaults, &local_err); + opts =3D qemu_opts_create(list, id, !defaults, errp); g_free(id); if (opts =3D=3D NULL) { - error_propagate(errp, local_err); return NULL; } =20 --=20 2.26.2