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regmap: potentially duplicate the name string stored in regmap

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Currently we just copy over the pointer passed to regmap_init() in
the regmap config struct. To be on the safe side: duplicate the string
with kstrdup_const() so that if an unaware user passes an address to
a stack-allocated buffer, we won't crash.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Bartosz Golaszewski 2017-12-13 17:25:31 +01:00 committed by Mark Brown
parent 4045559c09
commit 8253bb3f82
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GPG Key ID: 24D68B725D5487D0
1 changed files with 12 additions and 2 deletions
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14
drivers/base/regmap/regmap.c
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@ -672,6 +672,14 @@ struct regmap *__regmap_init(struct device *dev,
goto err;
}
if (config->name) {
map->name = kstrdup_const(config->name, GFP_KERNEL);
if (!map->name) {
ret = -ENOMEM;
goto err_map;
}
}
if (config->disable_locking) {
map->lock = map->unlock = regmap_lock_unlock_none;
regmap_debugfs_disable(map);
@ -683,7 +691,7 @@ struct regmap *__regmap_init(struct device *dev,
map->hwlock = hwspin_lock_request_specific(config->hwlock_id);
if (!map->hwlock) {
ret = -ENXIO;
goto err_map;
goto err_name;
}
switch (config->hwlock_mode) {
@ -763,7 +771,6 @@ struct regmap *__regmap_init(struct device *dev,
map->volatile_reg = config->volatile_reg;
map->precious_reg = config->precious_reg;
map->cache_type = config->cache_type;
map->name = config->name;
spin_lock_init(&map->async_lock);
INIT_LIST_HEAD(&map->async_list);
@ -1119,6 +1126,8 @@ err_range:
err_hwlock:
if (map->hwlock)
hwspin_lock_free(map->hwlock);
err_name:
kfree_const(map->name);
err_map:
kfree(map);
err:
@ -1308,6 +1317,7 @@ void regmap_exit(struct regmap *map)
}
if (map->hwlock)
hwspin_lock_free(map->hwlock);
kfree_const(map->name);
kfree(map);
}
EXPORT_SYMBOL_GPL(regmap_exit);