The various supported boards have different numbers of subdevices from 1
to 4. Each subdevice needs a block of registers in PCI BAR 0. Check
the region is large enough for the required number of subdevices.
Return an error from `jr3_pci_auto_attach()` if it is too small.
Signed-off-by: Ian Abbott <abbo...@mev.co.uk>
---
drivers/staging/comedi/drivers/jr3_pci.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/staging/comedi/drivers/jr3_pci.c
b/drivers/staging/comedi/drivers/jr3_pci.c
index c0ae92217932..a21344e1a4c3 100644
--- a/drivers/staging/comedi/drivers/jr3_pci.c
+++ b/drivers/staging/comedi/drivers/jr3_pci.c
@@ -705,6 +705,9 @@ static int jr3_pci_auto_attach(struct comedi_device *dev,
if (ret)
return ret;
+ if (pci_resource_len(pcidev, 0) < board->n_subdevs * sizeof(*block))
+ return -ENXIO;
+
dev->mmio = pci_ioremap_bar(pcidev, 0);
if (!dev->mmio)
return -ENOMEM;
--
2.11.0
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