[PATCH] driver: regmap: set debugfs_name to NULL after it is freed

From: Meng.Li@windriver.com
To: linux-kernel@vger.kernel.org, broonie@kernel.org,
	regkh@linuxfoundation.org, rafael@kernel.org
Cc: meng.li@windriver.com
Subject: [PATCH] driver: regmap: set debugfs_name to NULL after it is freed
Date: Fri, 26 Feb 2021 10:15:37 +0800	[thread overview]
Message-ID: <20210226021537.7530-1-Meng.Li@windriver.com> (raw)

From: Meng Li <Meng.Li@windriver.com>

There is a upstream commit cffa4b2122f5("regmap:debugfs:
Fix a memory leak when calling regmap_attach_dev") that
adds a if condition when create name for debugfs_name.
With below function invoking logical, debugfs_name is
freed in regmap_debugfs_exit(), but it is not created again
because of the if condition introduced by above commit.
regmap_reinit_cache()
	regmap_debugfs_exit()
	...
	regmap_debugfs_init()
So, set debugfs_name to NULL after it is freed.

Fixes: cffa4b2122f5("regmap: debugfs: Fix a memory leak when calling regmap_attach_dev")
Cc: stable@vger.kernel.org
Signed-off-by: Meng Li <Meng.Li@windriver.com>
---
 drivers/base/regmap/regmap-debugfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 398991381e9a..4f2ff1b2b450 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -661,6 +661,7 @@ void regmap_debugfs_exit(struct regmap *map)
 		regmap_debugfs_free_dump_cache(map);
 		mutex_unlock(&map->cache_lock);
 		kfree(map->debugfs_name);
+		map->debugfs_name = NULL;
 	} else {
 		struct regmap_debugfs_node *node, *tmp;
 
-- 
2.17.1

