On Wed, Aug 12, 2015 at 10:30:47AM -0700, H Hartley Sweeten wrote:
> @@ -1061,6 +1061,14 @@ static int do_chaninfo_ioctl(struct comedi_device *dev,
> if (it.maxdata_list) {
> if (s->maxdata || !s->maxdata_list)
> return -EINVAL;
> + /*
> + * s->n_chan is usually <= 32 but _some_ comedi drivers
> + * do have more. Do a simple sanity check to make sure
> + * copy_to_user() does not overflow. In reality this
> + * should never fail...
> + */
> + if (s->n_chan > (0xffffffff / sizeof(unsigned int)))
> + return -EINVAL;
> if (copy_to_user(it.maxdata_list, s->maxdata_list,
> s->n_chan * sizeof(unsigned int)))
This change doesn't make sense because an integer overflow here would be
basically harmless. I don't like silencing false positives in this way.
It's better to ignore the warning.
The bounds err in ni6501_port_command() was a false positive too, but
the fix for that made to code more readable so it was a good thing.
regards,
dan carpenter
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