linux-kernel - Re: [PATCH 2/4] kconfig: don't crash on NULL expressions in expr

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Date:   Tue, 17 Dec 2019 19:20:51 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Thomas Hebb <tommyhebb@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH 2/4] kconfig: don't crash on NULL expressions in expr_eq()

On Mon, Dec 9, 2019 at 5:19 PM Thomas Hebb <tommyhebb@...il.com> wrote:
>
> NULL expressions are taken to always be true, as implemented by the
> expr_is_yes() macro and by several other functions in expr.c. As such,
> they ought to be valid inputs to expr_eq(), which compares two
> expressions.
>
> Signed-off-by: Thomas Hebb <tommyhebb@...il.com>
> ---

I applied this patch.
I fixed up the block comment style. Thanks.


diff --git a/scripts/kconfig/expr.c b/scripts/kconfig/expr.c
index 8284444cc3fa..9f1de58e9f0c 100644
--- a/scripts/kconfig/expr.c
+++ b/scripts/kconfig/expr.c
@@ -254,8 +254,10 @@ static int expr_eq(struct expr *e1, struct expr *e2)
 {
        int res, old_count;

-       /* A NULL expr is taken to be yes, but there's also a different way to
-        * represent yes. expr_is_yes() checks for either representation. */
+       /*
+        * A NULL expr is taken to be yes, but there's also a different way to
+        * represent yes. expr_is_yes() checks for either representation.
+        */
        if (!e1 || !e2)
                return expr_is_yes(e1) && expr_is_yes(e2);





>  scripts/kconfig/expr.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/scripts/kconfig/expr.c b/scripts/kconfig/expr.c
> index 77ffff3a053c..8284444cc3fa 100644
> --- a/scripts/kconfig/expr.c
> +++ b/scripts/kconfig/expr.c
> @@ -254,6 +254,11 @@ static int expr_eq(struct expr *e1, struct expr *e2)
>  {
>         int res, old_count;
>
> +       /* A NULL expr is taken to be yes, but there's also a different way to
> +        * represent yes. expr_is_yes() checks for either representation. */
> +       if (!e1 || !e2)
> +               return expr_is_yes(e1) && expr_is_yes(e2);
> +
>         if (e1->type != e2->type)
>                 return 0;
>         switch (e1->type) {
> --
> 2.24.0
>


-- 
Best Regards
Masahiro Yamada