diff options
| -rw-r--r-- | kernel/livepatch/core.c | 52 |
1 files changed, 28 insertions, 24 deletions
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c index 1c3c9b27c916..8fd8e8f126da 100644 --- a/kernel/livepatch/core.c +++ b/kernel/livepatch/core.c @@ -537,22 +537,24 @@ static ssize_t signal_store(struct kobject *kobj, struct kobj_attribute *attr, int ret; bool val; - patch = container_of(kobj, struct klp_patch, kobj); - - /* - * klp_mutex lock is not grabbed here intentionally. It is not really - * needed. The race window is harmless and grabbing the lock would only - * hold the action back. - */ - if (patch != klp_transition_patch) - return -EINVAL; - ret = kstrtobool(buf, &val); if (ret) return ret; - if (val) - klp_send_signals(); + if (!val) + return count; + + mutex_lock(&klp_mutex); + + patch = container_of(kobj, struct klp_patch, kobj); + if (patch != klp_transition_patch) { + mutex_unlock(&klp_mutex); + return -EINVAL; + } + + klp_send_signals(); + + mutex_unlock(&klp_mutex); return count; } @@ -564,22 +566,24 @@ static ssize_t force_store(struct kobject *kobj, struct kobj_attribute *attr, int ret; bool val; - patch = container_of(kobj, struct klp_patch, kobj); - - /* - * klp_mutex lock is not grabbed here intentionally. It is not really - * needed. The race window is harmless and grabbing the lock would only - * hold the action back. - */ - if (patch != klp_transition_patch) - return -EINVAL; - ret = kstrtobool(buf, &val); if (ret) return ret; - if (val) - klp_force_transition(); + if (!val) + return count; + + mutex_lock(&klp_mutex); + + patch = container_of(kobj, struct klp_patch, kobj); + if (patch != klp_transition_patch) { + mutex_unlock(&klp_mutex); + return -EINVAL; + } + + klp_force_transition(); + + mutex_unlock(&klp_mutex); return count; } |