On Fri, Mar 01, 2013 at 03:06:07PM +0800, Li Zefan wrote: > We no longer fail rmdir() when there're still css refs, so we don't > need to check css refs in check_for_release(). > > This also voids a bug. cgroup_has_css_refs() accesses subsys[i] > without cgroup_mutex, so it can race with cgroup_unload_subsys(). > > cgroup_has_css_refs() > ... > if (ss == NULL || ss->root != cgrp->root) > > if ss pointers to net_cls_subsys, and cls_cgroup module is unloaded > right after the former check but before the latter, the memory that > net_cls_subsys resides has become invalid. > > Signed-off-by: Li Zefan <lizefan@xxxxxxxxxx> Applied to cgroup/for-3.10. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
