diff options
| -rw-r--r-- | kernel/user.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/user.c b/kernel/user.c index d9deae43a9a..2116642f42c 100644 --- a/kernel/user.c +++ b/kernel/user.c @@ -105,15 +105,19 @@ void free_uid(struct user_struct *up) { unsigned long flags; + if (!up) + return; + local_irq_save(flags); - if (up && atomic_dec_and_lock(&up->__count, &uidhash_lock)) { + if (atomic_dec_and_lock(&up->__count, &uidhash_lock)) { uid_hash_remove(up); + spin_unlock_irqrestore(&uidhash_lock, flags); key_put(up->uid_keyring); key_put(up->session_keyring); kmem_cache_free(uid_cachep, up); - spin_unlock(&uidhash_lock); + } else { + local_irq_restore(flags); } - local_irq_restore(flags); } struct user_struct * alloc_uid(uid_t uid) |