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bh=dwfmYuFFzBqquslyFAL9cyvY0xnkZl2pG7W0QNEk3/k=; b=Gqb6rlhyxDBWbxc127rjl5+q10400A/TRDFJiwkeuq20jK3b5S0nZN9ZzkhkU53LWbQq5a QgnAxfgAyF7BAEYoOubEmCPWjrWPHQ927QFUL+KNWF1vo+pAXhr44nPH00FTgEbroONdfc mpm3XyGc/JQYaSS6R2L4vjUeOx625UQ= X-MC-Unique: a-1vYrnZMyCPJNn89rxwcQ-1 From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PATCH 09/46] error: Avoid error_propagate() after migrate_add_blocker() Date: Wed, 24 Jun 2020 18:43:07 +0200 Message-Id: <20200624164344.3778251-10-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 10.5.11.16 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; 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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 | 5 ++--- hw/display/virtio-gpu-base.c | 5 +---- hw/intc/arm_gic_kvm.c | 4 +--- hw/intc/arm_gicv3_its_kvm.c | 4 +--- hw/intc/arm_gicv3_kvm.c | 4 +--- hw/misc/ivshmem.c | 4 +--- hw/scsi/vhost-scsi.c | 4 +--- 13 files changed, 20 insertions(+), 43 deletions(-) diff --git a/block/parallels.c b/block/parallels.c index a84ec6a518..860dbb80a2 100644 --- a/block/parallels.c +++ b/block/parallels.c @@ -862,9 +862,8 @@ 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 dca2a1fe7d..eefa3b63da 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 2f506a01ba..5fca67f52d 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 ac5a9094c4..b9ef4ff074 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 36412f764d..7290f36514 100644 --- a/block/vpc.c +++ b/block/vpc.c @@ -448,9 +448,8 @@ 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 c65a98e3ee..a28e3fa442 100644 --- a/block/vvfat.c +++ b/block/vvfat.c @@ -1282,9 +1282,8 @@ 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..87bc4aeca1 100644 --- a/hw/intc/arm_gicv3_its_kvm.c +++ b/hw/intc/arm_gicv3_its_kvm.c @@ -113,9 +113,7 @@ 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