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Date: Thu, 4 Oct 2012 14:09:16 -0400 From: Johannes Weiner <hannes@...xchg.org> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Michal Hocko <mhocko@...e.cz>, Konstantin Khlebnikov <khlebnikov@...nvz.org>, linux-mm@...ck.org, cgroups@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [patch 1/2] mm: memcontrol: handle potential crash when rmap races with task exit page_referenced() counts only references of mm's that are associated with the memcg hierarchy that is being reclaimed. However, if it races with the owner of the mm exiting, mm->owner may be NULL. Don't crash, just ignore the reference. Signed-off-by: Johannes Weiner <hannes@...xchg.org> Cc: stable@...nel.org [3.5] --- include/linux/memcontrol.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 8d9489f..8686294 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -91,7 +91,7 @@ int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup) rcu_read_lock(); memcg = mem_cgroup_from_task(rcu_dereference((mm)->owner)); - match = __mem_cgroup_same_or_subtree(cgroup, memcg); + match = memcg && __mem_cgroup_same_or_subtree(cgroup, memcg); rcu_read_unlock(); return match; } -- 1.7.11.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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