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bh=2Xwjy4vC7MjHICYCBn9Qjo+nhD6tqfJ+wavXyuhmhS4=; b=Brro8V8McImJEEcoJq2lPX7JC9gk9jp3FHiPeYLn8tpYwU0sFg0t1GTyBm5OJ9uZ+6X5oF kKUctlXavCpG6EEyatKYozlWWPTNGQkPa5KdD/7m1lGwmmXMzj0P2b7BwvDHAiDIHotj1j gaJeRG4Zm9IfAfdumqdiutQAmDAcXbU= X-MC-Unique: fqCiNL7COwCQqAVu7TjYMg-1 From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PATCH v2 41/44] error: Avoid error_propagate() after migrate_add_blocker() Date: Thu, 2 Jul 2020 17:49:57 +0200 Message-Id: <20200702155000.3455325-42-armbru@redhat.com> In-Reply-To: <20200702155000.3455325-1-armbru@redhat.com> References: <20200702155000.3455325-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 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; 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charset="utf-8" When migrate_add_blocker(blocker, &errp) is followed by error_propagate(errp, err), we can often just as well do migrate_add_blocker(..., errp). Do that with this Coccinelle script: @@ expression blocker, err, errp; expression ret; @@ - ret =3D migrate_add_blocker(blocker, &err); - if (err) { + ret =3D migrate_add_blocker(blocker, errp); + if (ret < 0) { ... when !=3D err; - error_propagate(errp, err); ... } @@ expression blocker, err, errp; @@ - migrate_add_blocker(blocker, &err); - if (err) { + if (migrate_add_blocker(blocker, errp) < 0) { ... when !=3D err; - error_propagate(errp, err); ... } Double-check @err is not used afterwards. Dereferencing it would be use after free, but checking whether it's null would be legitimate. Signed-off-by: Markus Armbruster Reviewed-by: Eric Blake Reviewed-by: Vladimir Sementsov-Ogievskiy --- block/parallels.c | 5 ++--- block/qcow.c | 6 ++---- block/vdi.c | 6 ++---- block/vhdx.c | 5 ++--- block/vmdk.c | 6 ++---- block/vpc.c | 5 ++--- block/vvfat.c | 6 ++---- hw/display/virtio-gpu-base.c | 5 +---- hw/intc/arm_gic_kvm.c | 4 +--- hw/intc/arm_gicv3_its_kvm.c | 5 +---- hw/intc/arm_gicv3_kvm.c | 4 +--- hw/misc/ivshmem.c | 4 +--- hw/scsi/vhost-scsi.c | 4 +--- 13 files changed, 20 insertions(+), 45 deletions(-) diff --git a/block/parallels.c b/block/parallels.c index f489c0d4ba..3c22dfdc9d 100644 --- a/block/parallels.c +++ b/block/parallels.c @@ -859,9 +859,8 @@ static int parallels_open(BlockDriverState *bs, QDict *= options, int flags, error_setg(&s->migration_blocker, "The Parallels format used by node '= %s' " "does not support live migration", bdrv_get_device_or_node_name(bs)); - ret =3D migrate_add_blocker(s->migration_blocker, &local_err); - if (local_err) { - error_propagate(errp, local_err); + ret =3D migrate_add_blocker(s->migration_blocker, errp); + if (ret < 0) { error_free(s->migration_blocker); goto fail; } diff --git a/block/qcow.c b/block/qcow.c index c22d1bf6b8..1e134f3445 100644 --- a/block/qcow.c +++ b/block/qcow.c @@ -121,7 +121,6 @@ static int qcow_open(BlockDriverState *bs, QDict *optio= ns, int flags, unsigned int len, i, shift; int ret; QCowHeader header; - Error *local_err =3D NULL; QCryptoBlockOpenOptions *crypto_opts =3D NULL; unsigned int cflags =3D 0; QDict *encryptopts =3D NULL; @@ -314,9 +313,8 @@ static int qcow_open(BlockDriverState *bs, QDict *optio= ns, int flags, error_setg(&s->migration_blocker, "The qcow format used by node '%s' " "does not support live migration", bdrv_get_device_or_node_name(bs)); - ret =3D migrate_add_blocker(s->migration_blocker, &local_err); - if (local_err) { - error_propagate(errp, local_err); + ret =3D migrate_add_blocker(s->migration_blocker, errp); + if (ret < 0) { error_free(s->migration_blocker); goto fail; } diff --git a/block/vdi.c b/block/vdi.c index 0a60be773e..3a3df45f84 100644 --- a/block/vdi.c +++ b/block/vdi.c @@ -375,7 +375,6 @@ static int vdi_open(BlockDriverState *bs, QDict *option= s, int flags, VdiHeader header; size_t bmap_size; int ret; - Error *local_err =3D NULL; QemuUUID uuid_link, uuid_parent; =20 bs->file =3D bdrv_open_child(NULL, options, "file", bs, &child_of_bds, @@ -496,9 +495,8 @@ static int vdi_open(BlockDriverState *bs, QDict *option= s, int flags, error_setg(&s->migration_blocker, "The vdi format used by node '%s' " "does not support live migration", bdrv_get_device_or_node_name(bs)); - ret =3D migrate_add_blocker(s->migration_blocker, &local_err); - if (local_err) { - error_propagate(errp, local_err); + ret =3D migrate_add_blocker(s->migration_blocker, errp); + if (ret < 0) { error_free(s->migration_blocker); goto fail_free_bmap; } diff --git a/block/vhdx.c b/block/vhdx.c index eed9c3b860..1f9fca837d 100644 --- a/block/vhdx.c +++ b/block/vhdx.c @@ -1089,9 +1089,8 @@ static int vhdx_open(BlockDriverState *bs, QDict *opt= ions, int flags, error_setg(&s->migration_blocker, "The vhdx format used by node '%s' " "does not support live migration", bdrv_get_device_or_node_name(bs)); - ret =3D migrate_add_blocker(s->migration_blocker, &local_err); - if (local_err) { - error_propagate(errp, local_err); + ret =3D migrate_add_blocker(s->migration_blocker, errp); + if (ret < 0) { error_free(s->migration_blocker); goto fail; } diff --git a/block/vmdk.c b/block/vmdk.c index 9a09193f3b..28cec50f38 100644 --- a/block/vmdk.c +++ b/block/vmdk.c @@ -1263,7 +1263,6 @@ static int vmdk_open(BlockDriverState *bs, QDict *opt= ions, int flags, int ret; BDRVVmdkState *s =3D bs->opaque; uint32_t magic; - Error *local_err =3D NULL; =20 bs->file =3D bdrv_open_child(NULL, options, "file", bs, &child_of_bds, BDRV_CHILD_IMAGE, false, errp); @@ -1317,9 +1316,8 @@ static int vmdk_open(BlockDriverState *bs, QDict *opt= ions, int flags, error_setg(&s->migration_blocker, "The vmdk format used by node '%s' " "does not support live migration", bdrv_get_device_or_node_name(bs)); - ret =3D migrate_add_blocker(s->migration_blocker, &local_err); - if (local_err) { - error_propagate(errp, local_err); + ret =3D migrate_add_blocker(s->migration_blocker, errp); + if (ret < 0) { error_free(s->migration_blocker); goto fail; } diff --git a/block/vpc.c b/block/vpc.c index 77043c2424..259d0ad2fe 100644 --- a/block/vpc.c +++ b/block/vpc.c @@ -446,9 +446,8 @@ static int vpc_open(BlockDriverState *bs, QDict *option= s, int flags, error_setg(&s->migration_blocker, "The vpc format used by node '%s' " "does not support live migration", bdrv_get_device_or_node_name(bs)); - ret =3D migrate_add_blocker(s->migration_blocker, &local_err); - if (local_err) { - error_propagate(errp, local_err); + ret =3D migrate_add_blocker(s->migration_blocker, errp); + if (ret < 0) { error_free(s->migration_blocker); goto fail; } diff --git a/block/vvfat.c b/block/vvfat.c index df4b993add..fc46de1cfc 100644 --- a/block/vvfat.c +++ b/block/vvfat.c @@ -1154,7 +1154,6 @@ static int vvfat_open(BlockDriverState *bs, QDict *op= tions, int flags, bool floppy; const char *dirname, *label; QemuOpts *opts; - Error *local_err =3D NULL; int ret; =20 #ifdef DEBUG @@ -1280,9 +1279,8 @@ static int vvfat_open(BlockDriverState *bs, QDict *op= tions, int flags, "The vvfat (rw) format used by node '%s' " "does not support live migration", bdrv_get_device_or_node_name(bs)); - ret =3D migrate_add_blocker(s->migration_blocker, &local_err); - if (local_err) { - error_propagate(errp, local_err); + ret =3D migrate_add_blocker(s->migration_blocker, errp); + if (ret < 0) { error_free(s->migration_blocker); goto fail; } diff --git a/hw/display/virtio-gpu-base.c b/hw/display/virtio-gpu-base.c index c159351be3..7961308606 100644 --- a/hw/display/virtio-gpu-base.c +++ b/hw/display/virtio-gpu-base.c @@ -128,7 +128,6 @@ virtio_gpu_base_device_realize(DeviceState *qdev, { VirtIODevice *vdev =3D VIRTIO_DEVICE(qdev); VirtIOGPUBase *g =3D VIRTIO_GPU_BASE(qdev); - Error *local_err =3D NULL; int i; =20 if (g->conf.max_outputs > VIRTIO_GPU_MAX_SCANOUTS) { @@ -139,9 +138,7 @@ virtio_gpu_base_device_realize(DeviceState *qdev, g->use_virgl_renderer =3D false; if (virtio_gpu_virgl_enabled(g->conf)) { error_setg(&g->migration_blocker, "virgl is not yet migratable"); - migrate_add_blocker(g->migration_blocker, &local_err); - if (local_err) { - error_propagate(errp, local_err); + if (migrate_add_blocker(g->migration_blocker, errp) < 0) { error_free(g->migration_blocker); return false; } diff --git a/hw/intc/arm_gic_kvm.c b/hw/intc/arm_gic_kvm.c index d7df423a7a..07b95143c9 100644 --- a/hw/intc/arm_gic_kvm.c +++ b/hw/intc/arm_gic_kvm.c @@ -517,9 +517,7 @@ static void kvm_arm_gic_realize(DeviceState *dev, Error= **errp) if (!kvm_arm_gic_can_save_restore(s)) { error_setg(&s->migration_blocker, "This operating system kernel do= es " "not support vGICv2 migration"); - migrate_add_blocker(s->migration_blocker, &local_err); - if (local_err) { - error_propagate(errp, local_err); + if (migrate_add_blocker(s->migration_blocker, errp) < 0) { error_free(s->migration_blocker); return; } diff --git a/hw/intc/arm_gicv3_its_kvm.c b/hw/intc/arm_gicv3_its_kvm.c index ad0ebabc87..46835ed085 100644 --- a/hw/intc/arm_gicv3_its_kvm.c +++ b/hw/intc/arm_gicv3_its_kvm.c @@ -91,7 +91,6 @@ static void vm_change_state_handler(void *opaque, int run= ning, static void kvm_arm_its_realize(DeviceState *dev, Error **errp) { GICv3ITSState *s =3D ARM_GICV3_ITS_COMMON(dev); - Error *local_err =3D NULL; =20 s->dev_fd =3D kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_ITS, = false); if (s->dev_fd < 0) { @@ -113,9 +112,7 @@ static void kvm_arm_its_realize(DeviceState *dev, Error= **errp) GITS_CTLR)) { error_setg(&s->migration_blocker, "This operating system kernel " "does not support vITS migration"); - migrate_add_blocker(s->migration_blocker, &local_err); - if (local_err) { - error_propagate(errp, local_err); + if (migrate_add_blocker(s->migration_blocker, errp) < 0) { error_free(s->migration_blocker); return; } diff --git a/hw/intc/arm_gicv3_kvm.c b/hw/intc/arm_gicv3_kvm.c index ca43bf87ca..eddd07c743 100644 --- a/hw/intc/arm_gicv3_kvm.c +++ b/hw/intc/arm_gicv3_kvm.c @@ -858,9 +858,7 @@ static void kvm_arm_gicv3_realize(DeviceState *dev, Err= or **errp) GICD_CTLR)) { error_setg(&s->migration_blocker, "This operating system kernel do= es " "not support vGICv3 migration"); - migrate_add_blocker(s->migration_blocker, &local_err); - if (local_err) { - error_propagate(errp, local_err); + if (migrate_add_blocker(s->migration_blocker, errp) < 0) { error_free(s->migration_blocker); return; } diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c index a8dc9b377d..fc128b25e2 100644 --- a/hw/misc/ivshmem.c +++ b/hw/misc/ivshmem.c @@ -898,9 +898,7 @@ static void ivshmem_common_realize(PCIDevice *dev, Erro= r **errp) if (!ivshmem_is_master(s)) { error_setg(&s->migration_blocker, "Migration is disabled when using feature 'peer mode' i= n device 'ivshmem'"); - migrate_add_blocker(s->migration_blocker, &err); - if (err) { - error_propagate(errp, err); + if (migrate_add_blocker(s->migration_blocker, errp) < 0) { error_free(s->migration_blocker); return; } diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c index c1b012aea4..13b05af29b 100644 --- a/hw/scsi/vhost-scsi.c +++ b/hw/scsi/vhost-scsi.c @@ -207,9 +207,7 @@ static void vhost_scsi_realize(DeviceState *dev, Error = **errp) "When external environment supports it (Orchestrator migra= tes " "target SCSI device state or use shared storage over netwo= rk), " "set 'migratable' property to true to enable migration."); - migrate_add_blocker(vsc->migration_blocker, &err); - if (err) { - error_propagate(errp, err); + if (migrate_add_blocker(vsc->migration_blocker, errp) < 0) { error_free(vsc->migration_blocker); goto free_virtio; } --=20 2.26.2