linux-kernel - [PATCH] mfd: syscon: Don't free allocated name for regmap

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Date:   Thu,  3 Sep 2020 17:02:37 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Lee Jones <lee.jones@...aro.org>, Arnd Bergmann <arnd@...db.de>,
        Suman Anna <s-anna@...com>, kernel-team@...roid.com
Subject: [PATCH] mfd: syscon: Don't free allocated name for regmap_config

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 <maz@...nel.org>
---
 drivers/mfd/syscon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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);
-- 
2.27.0