Re: [PATCH v2] [PATCH] KEYS: trusted: fix -Wvarags warning

[Nick Desaulniers]

On Wed, Oct 24, 2018 at 1:37 AM Jarkko Sakkinen
<jarkko.sakkinen@xxxxxxxxxxxxxxx> wrote:
>
> On Mon, 22 Oct 2018, ndesaulniers@xxxxxxxxxx wrote:
> > Fixes the warning reported by Clang:
> > security/keys/trusted.c:146:17: warning: passing an object that
> > undergoes default
> >      argument promotion to 'va_start' has undefined behavior [-Wvarargs]
> >        va_start(argp, h3);
> >                       ^
> > security/keys/trusted.c:126:37: note: parameter of type 'unsigned
> > char' is declared here
> > unsigned char *h2, unsigned char h3, ...)
> >                               ^
> > Specifically, it seems that both the C90 (4.8.1.1) and C11 (7.16.1.4)
> > standards explicitly call this out as undefined behavior:
> >
> > The parameter parmN is the identifier of the rightmost parameter in
> > the variable parameter list in the function definition (the one just
> > before the ...). If the parameter parmN is declared with ... or with a
> > type that is not compatible with the type that results after
> > application of the default argument promotions, the behavior is
> > undefined.
> >
> > Link: https://github.com/ClangBuiltLinux/linux/issues/41
> > Link: https://www.eskimo.com/~scs/cclass/int/sx11c.html
> > Suggested-by: David Laight <David.Laight@xxxxxxxxxx>
> > Suggested-by: Denis Kenzior <denkenz@xxxxxxxxx>
> > Suggested-by: James Bottomley <jejb@xxxxxxxxxxxxxxxxxx>
> > Suggested-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
> > Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
>
> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
>
> /Jarkko

Bumping the maintainers if this isn't already picked up?

-- 
Thanks,
~Nick Desaulniers