From: sparkhuang Date: Thu, 27 Nov 2025 02:57:16 +0000 (+0800) Subject: regulator: core: Protect regulator_supply_alias_list with regulator_list_mutex X-Git-Tag: v6.18.2~137 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=64099b5c0aeb70bc7cd5556eb7f59c5b4a5010bf;p=thirdparty%2Fkernel%2Fstable.git regulator: core: Protect regulator_supply_alias_list with regulator_list_mutex [ Upstream commit 0cc15a10c3b4ab14cd71b779fd5c9ca0cb2bc30d ] regulator_supply_alias_list was accessed without any locking in regulator_supply_alias(), regulator_register_supply_alias(), and regulator_unregister_supply_alias(). Concurrent registration, unregistration and lookups can race, leading to: 1 use-after-free if an alias entry is removed while being read, 2 duplicate entries when two threads register the same alias, 3 inconsistent alias mappings observed by consumers. Protect all traversals, insertions and deletions on regulator_supply_alias_list with the existing regulator_list_mutex. Fixes: a06ccd9c3785f ("regulator: core: Add ability to create a lookup alias for supply") Signed-off-by: sparkhuang Reviewed-by: Charles Keepax Link: https://patch.msgid.link/20251127025716.5440-1-huangshaobo3@xiaomi.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index fc93612f4ec0c..b38b087eccfd7 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1947,6 +1947,7 @@ static void regulator_supply_alias(struct device **dev, const char **supply) { struct regulator_supply_alias *map; + mutex_lock(®ulator_list_mutex); map = regulator_find_supply_alias(*dev, *supply); if (map) { dev_dbg(*dev, "Mapping supply %s to %s,%s\n", @@ -1955,6 +1956,7 @@ static void regulator_supply_alias(struct device **dev, const char **supply) *dev = map->alias_dev; *supply = map->alias_supply; } + mutex_unlock(®ulator_list_mutex); } static int regulator_match(struct device *dev, const void *data) @@ -2497,22 +2499,26 @@ int regulator_register_supply_alias(struct device *dev, const char *id, const char *alias_id) { struct regulator_supply_alias *map; + struct regulator_supply_alias *new_map; - map = regulator_find_supply_alias(dev, id); - if (map) - return -EEXIST; - - map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); - if (!map) + new_map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); + if (!new_map) return -ENOMEM; - map->src_dev = dev; - map->src_supply = id; - map->alias_dev = alias_dev; - map->alias_supply = alias_id; - - list_add(&map->list, ®ulator_supply_alias_list); + mutex_lock(®ulator_list_mutex); + map = regulator_find_supply_alias(dev, id); + if (map) { + mutex_unlock(®ulator_list_mutex); + kfree(new_map); + return -EEXIST; + } + new_map->src_dev = dev; + new_map->src_supply = id; + new_map->alias_dev = alias_dev; + new_map->alias_supply = alias_id; + list_add(&new_map->list, ®ulator_supply_alias_list); + mutex_unlock(®ulator_list_mutex); pr_info("Adding alias for supply %s,%s -> %s,%s\n", id, dev_name(dev), alias_id, dev_name(alias_dev)); @@ -2532,11 +2538,13 @@ void regulator_unregister_supply_alias(struct device *dev, const char *id) { struct regulator_supply_alias *map; + mutex_lock(®ulator_list_mutex); map = regulator_find_supply_alias(dev, id); if (map) { list_del(&map->list); kfree(map); } + mutex_unlock(®ulator_list_mutex); } EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);