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qdev: Fix crash by validating the object type 

QEMU crashed when I try to list device parameters and the driver name is
actually an available bus name.

 # qemu -device virtio-pci-bus,?
 # qemu -device virtio-bus,?
 # qemu -device virtio-serial-bus,?
 qdev-monitor.c:212:qdev_device_help: Object 0x7fd932f50620 is not an
 instance of type device
 Aborted (core dumped)

We can also reproduce this bug by adding device from monitor, so it's
worth to fix the crash.

 (qemu) device_add virtio-serial-bus
 qdev-monitor.c:491:qdev_device_add: Object 0x7f5e89530920 is not an
 instance of type device
 Aborted (core dumped)

Cc: qemu-stable@nongnu.org
Signed-off-by: Amos Kong <akong@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
(cherry picked from commit ce0abca3e3)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Amos Kong 2014-04-16 09:57:14 +08:00 committed by Michael Roth
parent 46a1b0e489
commit 837e02ef07
1 changed files with 1 additions and 1 deletions
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qdev-monitor.c
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@ -206,7 +206,7 @@ int qdev_device_help(QemuOpts *opts)
}
}
if (!klass) {
if (!object_class_dynamic_cast(klass, TYPE_DEVICE)) {
return 0;
}
do {