From 1f5cc359158772304a92ee9c5682ca83416d2ba8 Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Wed, 19 Sep 2012 17:26:53 -0700 Subject: [PATCH] staging: comedi: kcomedilib: fix a __user space access issue The 'data' field in struct comedi_insn is an unsigned int __user *. The comedi core copies this data to kernel space before passing it on to a drivers insn_bits/insn_config method. kcomedilib provides an interface for external kernel modules to use the comedi drivers. This interface creates a comedi_insn that is then passed to the comedi drivers insn_bits/insn_config method. Unfortunately, kcomedilib is using the comedi_insn 'data' field directly which results in some sparse warnings: warning: incorrect type in argument 4 (different address spaces) expected unsigned int * got unsigned int [noderef] *data warning: incorrect type in assignment (different address spaces) expected unsigned int [noderef] *[addressable] [assigned] data got unsigned int * Fix this by passing the kernel data directly, as a separate parameter, instead of trying to put in into the comedi_insn 'data' field. This is how the comedi core handles the data from user space. Signed-off-by: H Hartley Sweeten Cc: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- .../staging/comedi/kcomedilib/kcomedilib_main.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/staging/comedi/kcomedilib/kcomedilib_main.c b/drivers/staging/comedi/kcomedilib/kcomedilib_main.c index f96416d1d2f7..3f20ea55b8d0 100644 --- a/drivers/staging/comedi/kcomedilib/kcomedilib_main.c +++ b/drivers/staging/comedi/kcomedilib/kcomedilib_main.c @@ -80,7 +80,9 @@ int comedi_close(struct comedi_device *d) } EXPORT_SYMBOL(comedi_close); -static int comedi_do_insn(struct comedi_device *dev, struct comedi_insn *insn) +static int comedi_do_insn(struct comedi_device *dev, + struct comedi_insn *insn, + unsigned int *data) { struct comedi_subdevice *s; int ret = 0; @@ -115,11 +117,11 @@ static int comedi_do_insn(struct comedi_device *dev, struct comedi_insn *insn) switch (insn->insn) { case INSN_BITS: - ret = s->insn_bits(dev, s, insn, insn->data); + ret = s->insn_bits(dev, s, insn, data); break; case INSN_CONFIG: /* XXX should check instruction length */ - ret = s->insn_config(dev, s, insn, insn->data); + ret = s->insn_config(dev, s, insn, data); break; default: ret = -EINVAL; @@ -140,11 +142,10 @@ int comedi_dio_config(struct comedi_device *dev, unsigned int subdev, memset(&insn, 0, sizeof(insn)); insn.insn = INSN_CONFIG; insn.n = 1; - insn.data = &io; insn.subdev = subdev; insn.chanspec = CR_PACK(chan, 0, 0); - return comedi_do_insn(dev, &insn); + return comedi_do_insn(dev, &insn, &io); } EXPORT_SYMBOL(comedi_dio_config); @@ -158,13 +159,12 @@ int comedi_dio_bitfield(struct comedi_device *dev, unsigned int subdev, memset(&insn, 0, sizeof(insn)); insn.insn = INSN_BITS; insn.n = 2; - insn.data = data; insn.subdev = subdev; data[0] = mask; data[1] = *bits; - ret = comedi_do_insn(dev, &insn); + ret = comedi_do_insn(dev, &insn, data); *bits = data[1]; -- 2.39.5