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error: Avoid error_propagate() after migrate_add_blocker()

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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>
This commit is contained in:
Markus Armbruster 2020-07-07 18:06:10 +02:00
parent 7b3cb8037c
commit 386f6c07d2
13 changed files with 20 additions and 45 deletions
Download patch file Download diff file Expand all files Collapse all files

4
hw/scsi/vhost-scsi.c
View file

@ -207,9 +207,7 @@ static void vhost_scsi_realize(DeviceState *dev, Error **errp)
"When external environment supports it (Orchestrator migrates "
"target SCSI device state or use shared storage over network), "
"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;
}