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multi-process: Fix pci_proxy_dev_realize() error handling 

The Error ** argument must be NULL, &error_abort, &error_fatal, or a
pointer to a variable containing NULL.  Passing an argument of the
latter kind twice without clearing it in between is wrong: if the
first call sets an error, it no longer points to NULL for the second
call.

pci_proxy_dev_realize() is wrong that way: it passes @errp to
qio_channel_new_fd() without checking for failure.  If it runs into
another failure, it trips error_setv()'s assertion.

Fix it to check for failure properly.

Fixes: 9f8112073a
Cc: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Cc: Jagannathan Raman <jag.raman@oracle.com>
Cc: John G Johnson <john.g.johnson@oracle.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20210720125408.387910-5-armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Jagannathan Raman <jag.raman@oracle.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Markus Armbruster 2021-07-20 14:53:56 +02:00
parent d7f5013e12
commit 96ac971933
1 changed files with 9 additions and 1 deletions
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10
hw/remote/proxy.c
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@ -102,10 +102,18 @@ static void pci_proxy_dev_realize(PCIDevice *device, Error **errp)
}
dev->ioc = qio_channel_new_fd(fd, errp);
if (!dev->ioc) {
close(fd);
return;
}
error_setg(&dev->migration_blocker, "%s does not support migration",
TYPE_PCI_PROXY_DEV);
migrate_add_blocker(dev->migration_blocker, errp);
if (migrate_add_blocker(dev->migration_blocker, errp) < 0) {
error_free(dev->migration_blocker);
object_unref(dev->ioc);
return;
}
qemu_mutex_init(&dev->io_mutex);
qio_channel_set_blocking(dev->ioc, true, NULL);