linux-kernel - [PATCH] mfd: syscon: Fix leak of syscon name

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Date:   Tue, 25 May 2021 02:13:51 +0200
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Lee Jones <lee.jones@...aro.org>, Arnd Bergmann <arnd@...db.de>,
        linux-kernel@...r.kernel.org
Cc:     Ansuel Smith <ansuelsmth@...il.com>
Subject: [PATCH] mfd: syscon: Fix leak of syscon name

regmap_init_mmio duplicate the name and never free the provided name in
the sysconf_config. Always free the name instead of freeing only on
error to fix error from kmemleak generated by any syscon user.

Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
---
 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 c6f139b2e0c0..765c0210cb52 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -108,6 +108,7 @@ 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);
@@ -144,7 +145,6 @@ 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);
-- 
2.31.1