'curr' pointer in task_in_mem_cgroup() can be NULL when we race with somebody clearing task->mm. Check for it before dereferencing the pointer. Coverity-id: 1198369 Signed-off-by: Jan Kara <jack@xxxxxxx> --- mm/memcontrol.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 23976fd885fd..18ab127a0767 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1469,7 +1469,8 @@ bool task_in_mem_cgroup(struct task_struct *task, * hierarchy(even if use_hierarchy is disabled in "memcg"). */ ret = mem_cgroup_same_or_subtree(memcg, curr); - css_put(&curr->css); + if (curr) + css_put(&curr->css); return ret; } -- 1.8.1.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>