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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull perf fix from Ingo Molnar:
 "This fix adds missing RCU read protection"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  events: Protect access via task_subsys_state_check()
This commit is contained in:
Linus Torvalds 2013-04-27 10:08:09 -07:00
commit e09d13c4c8
1 changed files with 2 additions and 0 deletions
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2
kernel/events/core.c
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@ -4596,6 +4596,7 @@ void perf_event_comm(struct task_struct *task)
struct perf_event_context *ctx; struct perf_event_context *ctx;
int ctxn; int ctxn;
rcu_read_lock();
for_each_task_context_nr(ctxn) { for_each_task_context_nr(ctxn) {
ctx = task->perf_event_ctxp[ctxn]; ctx = task->perf_event_ctxp[ctxn];
if (!ctx) if (!ctx)
@ -4603,6 +4604,7 @@ void perf_event_comm(struct task_struct *task)
perf_event_enable_on_exec(ctx); perf_event_enable_on_exec(ctx);
} }
rcu_read_unlock();
if (!atomic_read(&nr_comm_events)) if (!atomic_read(&nr_comm_events))
return; return;