[PATCH ARM] selftests, arm64: fix uninitialized symbol in tags_test.c

[Andrey Konovalov]

On Mon, Aug 19, 2019 at 3:14 PM Andrey Konovalov <andreyknvl at google.com> wrote:
>
> Fix tagged_ptr not being initialized when TBI is not enabled.
>
> Dan Carpenter <dan.carpenter at oracle.com>
> Signed-off-by: Andrey Konovalov <andreyknvl at google.com>
> ---
>  tools/testing/selftests/arm64/tags_test.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/tools/testing/selftests/arm64/tags_test.c b/tools/testing/selftests/arm64/tags_test.c
> index 22a1b266e373..5701163460ef 100644
> --- a/tools/testing/selftests/arm64/tags_test.c
> +++ b/tools/testing/selftests/arm64/tags_test.c
> @@ -14,15 +14,17 @@
>  int main(void)
>  {
>         static int tbi_enabled = 0;
> -       struct utsname *ptr, *tagged_ptr;
> +       unsigned long tag = 0;
> +       struct utsname *ptr;
>         int err;
>
>         if (prctl(PR_SET_TAGGED_ADDR_CTRL, PR_TAGGED_ADDR_ENABLE, 0, 0, 0) == 0)
>                 tbi_enabled = 1;
>         ptr = (struct utsname *)malloc(sizeof(*ptr));
>         if (tbi_enabled)
> -               tagged_ptr = (struct utsname *)SET_TAG(ptr, 0x42);
> -       err = uname(tagged_ptr);
> +               tag = 0x42;
> +       ptr = (struct utsname *)SET_TAG(ptr, tag);
> +       err = uname(ptr);
>         free(ptr);
>
>         return err;
> --
> 2.23.0.rc1.153.gdeed80330f-goog
>

Hi Will,

This is supposed to go on top of the TBI related patches that you have
added to the arm tree.

Thanks!