[PATCH weston] config-parser: Catch negative numbers assigned to unsigned config values

[Bryce Harrington]

On Tue, Jul 12, 2016 at 01:17:20PM +0100, Eric Engestrom wrote:
> On Mon, Jul 11, 2016 at 05:55:15PM -0700, Bryce Harrington wrote:
> > strtoul() has a side effect that when given a string representing a
> > negative number, it returns a negated version as the value, and does not
> > flag an error.  IOW, strtoul("-42", &val) sets val to 42.  This could
> > potentially result in unintended surprise behaviors, such as if one were
> > to inadvertantly set a config param to -1 expecting that to disable it,
> > but with the result of setting the param to 1 instead.
> > 
> > Catch this by using strtol() and then manually check for the negative
> > value.  This logic is modelled after Wayland's strtouint().
> > 
> > Note that this change unfortunately reduces the range of parseable
> > numbers from [0,UINT_MAX] to [0,INT_MAX].  The current users of
> > weston_config_section_get_uint() are anticipating numbers far smaller
> > than either of these limits, so the change is believed to have no impact
> > in practice.
> > 
> > Also add a test case for negative numbers that catches this error
> > condition.
> > 
> > Signed-off-by: Bryce Harrington <bryce at osg.samsung.com>
> 
> Looks good to me.
> Reviewed-by: Eric Engestrom <eric.engestrom at imgtec.com>

Thanks, pushed:
   5ba41eb..6351fb0  master -> master