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staging/comedi: Fix undefined array subscript

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In vmk80xx_do_insn_bits the local variable reg, which is used as an
index to the tx_buf array, can be used uninitialized if
- data[0] == 0
and
- devpriv->model != VMK8061_MODEL
-> we get into the else branch without having reg initialized.

Since the driver usually differentiates between VMK8061_MODEL and
VMK8055_MODEL it's safe to assume that VMK8055_DO_REG was meant as an
initial value.

And to avoid duplication we can move the assignments to the top.

Acked-by: Ian Abbott <abbotti@mev.co.uk>
Acked-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Huewe 2013-02-13 15:28:14 +01:00 committed by Greg Kroah-Hartman
parent b7e6724238
commit fc9ca48eb6
1 changed files with 7 additions and 10 deletions
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17
drivers/staging/comedi/drivers/vmk80xx.c
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@ -675,8 +675,14 @@ static int vmk80xx_do_insn_bits(struct comedi_device *dev,
if (data[0])
dir |= DIR_OUT;
if (devpriv->model == VMK8061_MODEL)
if (devpriv->model == VMK8061_MODEL) {
dir |= DIR_IN;
reg = VMK8061_DO_REG;
cmd = VMK8061_CMD_DO;
} else { /* VMK8055_MODEL */
reg = VMK8055_DO_REG;
cmd = VMK8055_CMD_WRT_AD;
}
retval = rudimentary_check(devpriv, dir);
if (retval)
@ -688,14 +694,6 @@ static int vmk80xx_do_insn_bits(struct comedi_device *dev,
tx_buf = devpriv->usb_tx_buf;
if (data[0]) {
if (devpriv->model == VMK8055_MODEL) {
reg = VMK8055_DO_REG;
cmd = VMK8055_CMD_WRT_AD;
} else { /* VMK8061_MODEL */
reg = VMK8061_DO_REG;
cmd = VMK8061_CMD_DO;
}
tx_buf[reg] &= ~data[0];
tx_buf[reg] |= (data[0] & data[1]);
@ -706,7 +704,6 @@ static int vmk80xx_do_insn_bits(struct comedi_device *dev,
}
if (devpriv->model == VMK8061_MODEL) {
reg = VMK8061_DO_REG;
tx_buf[0] = VMK8061_CMD_RD_DO;
retval = vmk80xx_read_packet(devpriv);