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sched: Use rq->rd in sched_setaffinity() under RCU read lock 

Probability of use-after-free isn't zero in this place.

Signed-off-by: Kirill Tkhai <ktkhai@parallels.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <stable@vger.kernel.org> # v3.14+
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20140922183636.11015.83611.stgit@localhost
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill Tkhai 2014-09-22 22:36:36 +04:00 committed by Ingo Molnar
parent 16303ab2fe
commit f1e3a0932f
1 changed files with 5 additions and 4 deletions
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9
kernel/sched/core.c
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@ -4049,13 +4049,14 @@ long sched_setaffinity(pid_t pid, const struct cpumask *in_mask)
* root_domain.
*/
#ifdef CONFIG_SMP
if (task_has_dl_policy(p)) {
const struct cpumask *span = task_rq(p)->rd->span;
if (dl_bandwidth_enabled() && !cpumask_subset(span, new_mask)) {
if (task_has_dl_policy(p) && dl_bandwidth_enabled()) {
rcu_read_lock();
if (!cpumask_subset(task_rq(p)->rd->span, new_mask)) {
retval = -EBUSY;
rcu_read_unlock();
goto out_free_new_mask;
}
rcu_read_unlock();
}
#endif
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