On Thu, 03 Sep 2020, Marc Zyngier wrote:
> The name allocated for the regmap_config structure is freed
> pretty early, right after the registration of the MMIO region.
>
> Unfortunately, that doesn't follow the life cycle that debugfs
> expects, as it can access the name field long after the free
> has occured.
>
> Move the free on the error path, and keep it forever otherwise.
>
> Fixes: e15d7f2b81d2 ("mfd: syscon: Use a unique name with regmap_config")
> Signed-off-by: Marc Zyngier <m...@kernel.org>
> ---
> drivers/mfd/syscon.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Does this work for you Suman, Arnd?
> diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
> index 75859e492984..7a660411c562 100644
> --- a/drivers/mfd/syscon.c
> +++ b/drivers/mfd/syscon.c
> @@ -108,7 +108,6 @@ static struct syscon *of_syscon_register(struct
> device_node *np, bool check_clk)
> syscon_config.max_register = resource_size(&res) - reg_io_width;
>
> regmap = regmap_init_mmio(NULL, base, &syscon_config);
> - kfree(syscon_config.name);
> if (IS_ERR(regmap)) {
> pr_err("regmap init failed\n");
> ret = PTR_ERR(regmap);
> @@ -145,6 +144,7 @@ static struct syscon *of_syscon_register(struct
> device_node *np, bool check_clk)
> regmap_exit(regmap);
> err_regmap:
> iounmap(base);
> + kfree(syscon_config.name);
> err_map:
> kfree(syscon);
> return ERR_PTR(ret);
--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
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