[PATCH] lib: uuid: fix the test on RNG device presence

[Simon Glass]

On Fri, 22 Oct 2021 at 09:05, Patrick Delaunay
<patrick.delaunay at foss.st.com> wrote:
>
> Correct the test on RNG device presence,when ret is equal to 0,
> before to call dm_rng_read function.
>
> Without this patch the RNG device is not used when present (when ret == 0)
> or a data abort occurs in dm_rng_read when CONFIG_DM_RNG is activated but
> the RNG device is not present in device tree (ret != 0 and devp = NULL).
>
> Fixes: 92fdad28cfdf ("lib: uuid: use RNG device if present")
> CC: Matthias Brugger <mbrugger at suse.com>
> CC: Torsten Duwe <duwe at suse.de>
> Signed-off-by: Patrick Delaunay <patrick.delaunay at foss.st.com>
> ---
>
>  lib/uuid.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Simon Glass <sjg at chromium.org>

OMG


>
> diff --git a/lib/uuid.c b/lib/uuid.c
> index 67267c66a3..e4703dce2b 100644
> --- a/lib/uuid.c
> +++ b/lib/uuid.c
> @@ -257,7 +257,7 @@ void gen_rand_uuid(unsigned char *uuid_bin)
>
>         if (IS_ENABLED(CONFIG_DM_RNG)) {
>                 ret = uclass_get_device(UCLASS_RNG, 0, &devp);
> -               if (ret) {
> +               if (!ret) {
>                         ret = dm_rng_read(devp, &randv, sizeof(randv));
>                         if (ret < 0)
>                                 randv = 0;
> --
> 2.25.1
>