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authorTejun Heo <tj@kernel.org>2012-11-06 09:17:37 -0800
committerTejun Heo <tj@kernel.org>2012-11-06 12:25:51 -0800
commit201e72acb2d3821e2de9ce6091e98859c316b29a (patch)
tree01e47038346474d659714151b8209673c11f330a /block
parent64e104771351d365e51e588a0e9a656ae6ed2f50 (diff)
device_cgroup: fix RCU usage
dev_cgroup->exceptions is protected with devcgroup_mutex for writes and RCU for reads; however, RCU usage isn't correct. * dev_exception_clean() doesn't use RCU variant of list_del() and kfree(). The function can race with may_access() and may_access() may end up dereferencing already freed memory. Use list_del_rcu() and kfree_rcu() instead. * may_access() may be called only with RCU read locked but doesn't use RCU safe traversal over ->exceptions. Use list_for_each_entry_rcu(). Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com> Cc: stable@vger.kernel.org Cc: Aristeu Rozanski <aris@redhat.com> Cc: Li Zefan <lizefan@huawei.com>
Diffstat (limited to 'block')
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