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hmp: do not crash on invalid SCSI hotplug

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Commit 0d93692 (qdev: Convert busses to QEMU Object Model, 2012-05-02)
removed a check on the type of the bus where a SCSI disk is hotplugged.
However, hot-plugging to the wrong kind of device now causes a crash
due to either a NULL pointer dereference (avoided by the previous patch)
or a failed QOM cast.

Instead, in this case we need to use object_dynamic_cast and check for
the result, similar to what was done before that commit.

Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Paolo Bonzini 2012-11-23 16:56:18 +01:00 committed by Anthony Liguori
parent b7f43fe460
commit b5007bcc97
1 changed files with 7 additions and 1 deletions
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8
hw/pci-hotplug.c
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@ -80,7 +80,13 @@ static int scsi_hot_add(Monitor *mon, DeviceState *adapter,
SCSIBus *scsibus;
SCSIDevice *scsidev;
scsibus = SCSI_BUS(QLIST_FIRST(&adapter->child_bus));
scsibus = (SCSIBus *)
object_dynamic_cast(OBJECT(QLIST_FIRST(&adapter->child_bus)),
TYPE_SCSI_BUS);
if (!scsibus) {
error_report("Device is not a SCSI adapter");
return -1;
}
/*
* drive_init() tries to find a default for dinfo->unit. Doesn't