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staging: comedi: me_daq: fix pointer dereference in me_detach()

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As pointed out by Dan Carpenter, dev_private could be NULL when it
is checked before calling comedi_pci_disable(). The private data
variable 'plx_regbase_size' is only used to see if the pci device
has been enabled.

Remove that variable from the private data and just use the unused
dev->iobase variable to let the detach know that the pci device
is enabled.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2012-10-25 15:05:46 -07:00 committed by Greg Kroah-Hartman
parent 0014048e09
commit 736b605c89
1 changed files with 4 additions and 7 deletions
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11
drivers/staging/comedi/drivers/me_daq.c
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@ -224,7 +224,6 @@ static const struct me_board me_boards[] = {
struct me_private_data {
void __iomem *plx_regbase; /* PLX configuration base address */
void __iomem *me_regbase; /* Base address of the Meilhaus card */
unsigned long plx_regbase_size; /* Size of PLX configuration space */
unsigned long me_regbase_size; /* Size of Meilhaus space */
unsigned short control_1; /* Mirror of CONTROL_1 register */
@ -639,7 +638,6 @@ static int me_attach_pci(struct comedi_device *dev, struct pci_dev *pcidev)
struct me_private_data *dev_private;
struct comedi_subdevice *s;
resource_size_t plx_regbase_tmp;
unsigned long plx_regbase_size_tmp;
resource_size_t me_regbase_tmp;
unsigned long me_regbase_size_tmp;
resource_size_t swap_regbase_tmp;
@ -664,13 +662,12 @@ static int me_attach_pci(struct comedi_device *dev, struct pci_dev *pcidev)
"Failed to enable PCI device and request regions\n");
return -EIO;
}
dev->iobase = 1; /* detach needs this */
/* Read PLX register base address [PCI_BASE_ADDRESS #0]. */
plx_regbase_tmp = pci_resource_start(pcidev, 0);
plx_regbase_size_tmp = pci_resource_len(pcidev, 0);
dev_private->plx_regbase =
ioremap(plx_regbase_tmp, plx_regbase_size_tmp);
dev_private->plx_regbase_size = plx_regbase_size_tmp;
dev_private->plx_regbase = ioremap(plx_regbase_tmp,
pci_resource_len(pcidev, 0));
if (!dev_private->plx_regbase) {
dev_err(dev->class_dev, "Failed to remap I/O memory\n");
return -ENOMEM;
@ -791,7 +788,7 @@ static void me_detach(struct comedi_device *dev)
iounmap(dev_private->plx_regbase);
}
if (pcidev) {
if (dev_private->plx_regbase_size)
if (dev->iobase)
comedi_pci_disable(pcidev);
pci_dev_put(pcidev);
}