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Re: [PATCH v3 10/18] hw/isa: Ensure isa_register_portio_list() do not ge


From: Mark Cave-Ayland
Subject: Re: [PATCH v3 10/18] hw/isa: Ensure isa_register_portio_list() do not get NULL ISA device
Date: Wed, 26 Apr 2023 14:16:40 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.13.0

On 02/03/2023 22:40, Philippe Mathieu-Daudé wrote:

Previous commit removed the single call to isa_register_portio_list()
with dev=NULL. To be sure we won't reintroduce such weird (ab)use,
assert dev is non-NULL.

We can now calls isa_address_space_io() to get the device I/O region.

Note we can then remove the NULL check in isa_init_ioport() because
it is only called in 2 places (and is static to this file):
- isa_register_ioport() which first calls isa_address_space_io(),
   itself asserting dev is not NULL.
- isa_register_portio_list() which also asserts dev is not NULL
   since the previous commit.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
  hw/isa/isa-bus.c | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/isa/isa-bus.c b/hw/isa/isa-bus.c
index 081bac18ee..9c8224afa5 100644
--- a/hw/isa/isa-bus.c
+++ b/hw/isa/isa-bus.c
@@ -113,7 +113,7 @@ IsaDma *isa_bus_get_dma(ISABus *bus, int nchan)
static inline void isa_init_ioport(ISADevice *dev, uint16_t ioport)
  {
-    if (dev && (dev->ioport_id == 0 || ioport < dev->ioport_id)) {
+    if (dev->ioport_id == 0 || ioport < dev->ioport_id) {
          dev->ioport_id = ioport;
      }
  }
@@ -129,6 +129,7 @@ int isa_register_portio_list(ISADevice *dev,
                               const MemoryRegionPortio *pio_start,
                               void *opaque, const char *name)
  {
+    assert(dev);
      assert(piolist && !piolist->owner);
if (!isabus) {

Yes!

Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>


ATB,

Mark.



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