regulator: core: Protect regulator_supply_alias_list with regulator_list_mutex

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: regulator: core: Protect regulator_supply_alias_list with regulator_list_mutex 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.

References

• https://git.kernel.org/stable/c/e1587064137028e7edcca14fb766b68d27bec94b
• https://git.kernel.org/stable/c/9d041a7ba13f21adfac052eb3fda1df62f2166c1
• https://git.kernel.org/stable/c/a63fbc07d1b34a9821ea3b31ff4e6456f9d0aa61
• https://git.kernel.org/stable/c/09811a83b214cc15521e0d818e43ae9043e9a28d
• https://git.kernel.org/stable/c/a9864d42ebcdd394ebb864643b961b36e7b515be
• https://git.kernel.org/stable/c/431a1d44ad4866362cc28fc1cc4ca93d84989239
• https://git.kernel.org/stable/c/64099b5c0aeb70bc7cd5556eb7f59c5b4a5010bf
• https://git.kernel.org/stable/c/0cc15a10c3b4ab14cd71b779fd5c9ca0cb2bc30d