[PATCH] env: Leave invalid env for nowhere location

[Marek Vasut <marex@denx.de>]

On 5/12/21 4:09 PM, Kunihiko Hayashi wrote:
> When CONFIG_ENV_IS_NOWHERE is enabled, env_nowhere_init() sets ENV_INVALID
> to gd->env_valid, and sets default_environment before relocation to
> gd->env_addr. After that, env_init() switches gd->env_valid to ENV_VALID
> by the previous fix.
> 
> If gd->env_valid is ENV_INVALID, env_get_char() returns relocated
> default_environment, however, env_get_char() returns gd->env_addr before
> relocation since gd->env_valid is ENV_VALID, and access to gd->env_addr
> will cause a fault.
> 
> This leaves gd->env_valid as ENV_INVALID for "nowhere" location.
> 
> Cc: Marek Vasut <marex@denx.de>
> Fixes: 5557eec01cbf ("env: Fix invalid env handling in env_init()")
> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
> ---
>   env/env.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/env/env.c b/env/env.c
> index e534008..3233172 100644
> --- a/env/env.c
> +++ b/env/env.c
> @@ -336,7 +336,8 @@ int env_init(void)
>   		debug("%s: Environment %s init done (ret=%d)\n", __func__,
>   		      drv->name, ret);
>   
> -		if (gd->env_valid == ENV_INVALID)
> +		if (gd->env_valid == ENV_INVALID
> +		    && drv->location != ENVL_NOWHERE)
>   			ret = -ENOENT;
>   	}

I'm CCing Tim, it would be good to get a TB from him.