/* * Scheduler code and data structures related to cpufreq. * * Copyright (C) 2016, Intel Corporation * Author: Rafael J. Wysocki * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include "sched.h" DEFINE_PER_CPU(struct update_util_data *, cpufreq_update_util_data); /** * cpufreq_add_update_util_hook - Populate the CPU's update_util_data pointer. * @cpu: The CPU to set the pointer for. * @data: New pointer value. * @func: Callback function to set for the CPU. * * Set and publish the update_util_data pointer for the given CPU. * * The update_util_data pointer of @cpu is set to @data and the callback * function pointer in the target struct update_util_data is set to @func. * That function will be called by cpufreq_update_util() from RCU-sched * read-side critical sections, so it must not sleep. @data will always be * passed to it as the first argument which allows the function to get to the * target update_util_data structure and its container. * * The update_util_data pointer of @cpu must be NULL when this function is * called or it will WARN() and return with no effect. */ void cpufreq_add_update_util_hook(int cpu, struct update_util_data *data, void (*func)(struct update_util_data *data, u64 time, unsigned int flags)) { if (WARN_ON(!data || !func)) return; if (WARN_ON(per_cpu(cpufreq_update_util_data, cpu))) return; data->func = func; rcu_assign_pointer(per_cpu(cpufreq_update_util_data, cpu), data); } EXPORT_SYMBOL_GPL(cpufreq_add_update_util_hook); /** * cpufreq_remove_update_util_hook - Clear the CPU's update_util_data pointer. * @cpu: The CPU to clear the pointer for. * * Clear the update_util_data pointer for the given CPU. * * Callers must use RCU-sched callbacks to free any memory that might be * accessed via the old update_util_data pointer or invoke synchronize_sched() * right after this function to avoid use-after-free. */ void cpufreq_remove_update_util_hook(int cpu) { rcu_assign_pointer(per_cpu(cpufreq_update_util_data, cpu), NULL); } EXPORT_SYMBOL_GPL(cpufreq_remove_update_util_hook); ion='/cgit.cgi/linux/net-next.git/log/include/net/sctp'>
path: root/include/net/sctp
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l_unlabeled.c?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>patch)
tree75f65eba7eac9277971082a2d5a4cf1370562c0c /net/netlabel/netlabel_unlabeled.c
parent7ce7d89f48834cefece7804d38fc5d85382edf77 (diff)
cgroup: don't online subsystems before cgroup_name/path() are operational
While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems before the new cgroup is associated with it kernfs_node. This is fine for cgroup proper but cgroup_name/path() depend on the associated kernfs_node and if a subsystem makes the new cgroup_subsys_state visible, which they're allowed to after onlining, it can lead to NULL dereference. The current code performs cgroup creation and subsystem onlining in cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems visible afterwards. There's no reason to online the subsystems early and we can simply drop cgroup_apply_control_enable() call from cgroup_create() so that the subsystems are onlined and made visible at the same time. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") Cc: stable@vger.kernel.org # v4.6+
Diffstat (limited to 'net/netlabel/netlabel_unlabeled.c')