Re: Coverity CID 1421984

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Cc'ing qemu-ppc since this is restricted to the aCube Sam460ex board.

On 3/23/20 12:46 PM, Max Reitz wrote:
> Hi,
> 
> I was triaging new Coverity block layer reports today, and one that
> seemed like a real bug was CID 1421984:
> 
> It complains about a memleak in sii3112_pci_realize() in
> hw/ide/sii3112.c, specifically about @irq being leaked (it’s allocated
> by qemu_allocate_irqs(), but never put anywhere or freed).
> 
> I’m not really well-versed in anything under hw/ide, so I was wondering
> whether you agree it’s a bug and whether you know the correct way to fix
> it.  (I assume it’s just a g_free(irqs), but maybe there’s a more
> specific way that’s applicable here.)

What does other devices is hold a reference in the DeviceState 
(SiI3112PCIState) to make static analyzers happy.

Ideally we should free such memory in the DeviceUnrealize handler, but 
we in the reality we only care for hotunpluggable devices.
PCI devices usually are. There is a trick however, you can mark 
overwrite the DeviceClass::hotpluggable field in sii3112_pci_class_init:

   dc->hotpluggable = false;