Re: [PATCH] kmod: Check for NULL at call_usermodehelper_exec().

From: Oleg Nesterov
Date: Sun Sep 15 2013 - 13:22:12 EST


On 09/16, Tetsuo Handa wrote:
>
> Oleg Nesterov wrote:
> > It looks a bit ugly to check ->path under helper_lock(), just add
> >
> > if (!sub_info->path)
> > retval = -ENOENT;
> >
> > at the start. Otherwise the code looks as if there is a subtle
> > reason to take the lock before this check.
>
> Did you mean this?
>
> DECLARE_COMPLETION_ONSTACK(done);
> int retval = 0;
>
> + if (!sub_info->path) {
> + call_usermodehelper_freeinfo(sub_info);

Aah, sorry! I forgot about _freeinfo().

I still think that perhaps it makes sense to update the changelog,
but this is minor.

Acked-by: Oleg Nesterov <oleg@xxxxxxxxxx>

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