error: Avoid error_propagate() after migrate_add_blocker()
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 = migrate_add_blocker(blocker, &err);
- if (err) {
+ ret = migrate_add_blocker(blocker, errp);
+ if (ret < 0) {
... when != err;
- error_propagate(errp, err);
...
}
@@
expression blocker, err, errp;
@@
- migrate_add_blocker(blocker, &err);
- if (err) {
+ if (migrate_add_blocker(blocker, errp) < 0) {
... when != 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 <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20200707160613.848843-43-armbru@redhat.com>
diff --git a/block/parallels.c b/block/parallels.c
index f489c0d..3c22dfd 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -859,9 +859,8 @@
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 = migrate_add_blocker(s->migration_blocker, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
+ ret = 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 c22d1bf..1e134f3 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -121,7 +121,6 @@
unsigned int len, i, shift;
int ret;
QCowHeader header;
- Error *local_err = NULL;
QCryptoBlockOpenOptions *crypto_opts = NULL;
unsigned int cflags = 0;
QDict *encryptopts = NULL;
@@ -314,9 +313,8 @@
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 = migrate_add_blocker(s->migration_blocker, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
+ ret = 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 2496d51..5627e7d 100644
--- a/block/vdi.c
+++ b/block/vdi.c
@@ -374,7 +374,6 @@
VdiHeader header;
size_t bmap_size;
int ret;
- Error *local_err = NULL;
QemuUUID uuid_link, uuid_parent;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
@@ -495,9 +494,8 @@
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 = migrate_add_blocker(s->migration_blocker, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
+ ret = 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 a36d9d9..791eb90 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -1089,9 +1089,8 @@
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 = migrate_add_blocker(s->migration_blocker, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
+ ret = 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 9a09193..28cec50 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1263,7 +1263,6 @@
int ret;
BDRVVmdkState *s = bs->opaque;
uint32_t magic;
- Error *local_err = NULL;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
BDRV_CHILD_IMAGE, false, errp);
@@ -1317,9 +1316,8 @@
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 = migrate_add_blocker(s->migration_blocker, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
+ ret = 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 131b9db..8905542 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -446,9 +446,8 @@
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 = migrate_add_blocker(s->migration_blocker, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
+ ret = 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 24d3622..36b53c8 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -1141,7 +1141,6 @@
bool floppy;
const char *dirname, *label;
QemuOpts *opts;
- Error *local_err = NULL;
int ret;
#ifdef DEBUG
@@ -1267,9 +1266,8 @@
"The vvfat (rw) format used by node '%s' "
"does not support live migration",
bdrv_get_device_or_node_name(bs));
- ret = migrate_add_blocker(s->migration_blocker, &local_err);
- if (local_err) {
- error_propagate(errp, local_err);
+ ret = migrate_add_blocker(s->migration_blocker, errp);
+ if (ret < 0) {
error_free(s->migration_blocker);
goto fail;
}
