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staging: comedi: jr3_pci: check PCI BAR 0 size

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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 <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2017-03-08 18:44:31 +00:00 • committed by Greg Kroah-Hartman
commit 8abde9acdf
1 changed files with 3 additions and 0 deletions
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3
drivers/staging/comedi/drivers/jr3_pci.c
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@ -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;