Re: [PATCH v2] proc_sysctl: fix oops caused by incorrect command parameters.

[Andrew Morton]

On Fri, 8 Jan 2021 21:10:25 +0100 Michal Hocko <mhocko@xxxxxxxx> wrote:

> > > Why would that matter? A missing value is clearly a error path and it
> > > should be reported.
> > 
> > This test is in the correct place. I think it's just a question of the
> > return values.
> 
> I was probably not clear. The test for val is at the right place. I
> would just expect -EINVAL and have the generic code to report.

It does seem a bit screwy that process_sysctl_arg() returns zero in all
situations (parse_args() is set up to handle an error return from it). 
But this patch is consistent with all the other error handling in
process_sysctl_arg().