hw/ide: Fix crash when plugging a piix3-ide device into the x-remote machine
QEMU currently crashes when the user tries to do something like:
qemu-system-x86_64 -M x-remote -device piix3-ide
This happens because the "isabus" variable is not initialized with
the x-remote machine yet. Add a proper check for this condition
and propagate the error to the caller, so we can fail there gracefully.
Message-Id: <20210416125256.2039734-1-thuth@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
diff --git a/hw/isa/isa-bus.c b/hw/isa/isa-bus.c
index 7820068..cffaa35 100644
--- a/hw/isa/isa-bus.c
+++ b/hw/isa/isa-bus.c
@@ -131,13 +131,17 @@
isa_init_ioport(dev, start);
}
-void isa_register_portio_list(ISADevice *dev,
- PortioList *piolist, uint16_t start,
- const MemoryRegionPortio *pio_start,
- void *opaque, const char *name)
+int isa_register_portio_list(ISADevice *dev,
+ PortioList *piolist, uint16_t start,
+ const MemoryRegionPortio *pio_start,
+ void *opaque, const char *name)
{
assert(piolist && !piolist->owner);
+ if (!isabus) {
+ return -ENODEV;
+ }
+
/* START is how we should treat DEV, regardless of the actual
contents of the portio array. This is how the old code
actually handled e.g. the FDC device. */
@@ -145,6 +149,8 @@
portio_list_init(piolist, OBJECT(dev), pio_start, opaque, name);
portio_list_add(piolist, isabus->address_space_io, start);
+
+ return 0;
}
static void isa_device_init(Object *obj)
