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

From: Meng . Li
Date: Thu Feb 25 2021 - 21:19:11 EST


From: Meng Li <Meng.Li@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxx
Signed-off-by: Meng Li <Meng.Li@xxxxxxxxxxxxx>
---
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