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staging: comedi: don't dereference user memory for INSN_INTTRIG 

`parse_insn()` is dereferencing the user-space pointer `insn->data`
directly when handling the `INSN_INTTRIG` comedi instruction.  It
shouldn't be using `insn->data` at all; it should be using the separate
`data` pointer passed to the function.  Fix it.

Cc: stable <stable@vger.kernel.org>
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 2012-09-18 19:46:58 +01:00 committed by Greg Kroah-Hartman
parent 9f82e95773
commit 5d06e3df28
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/comedi/comedi_fops.c
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@ -950,7 +950,7 @@ static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
ret = -EAGAIN;
break;
}
ret = s->async->inttrig(dev, s, insn->data[0]);
ret = s->async->inttrig(dev, s, data[0]);
if (ret >= 0)
ret = 1;
break;