On Fri, 2020-10-09 at 12:41 +0200, Johannes Berg wrote: > If the fops doesn't have a release method, we don't even need > to keep a reference to the real_fops, we can just fops_put() > them already in debugfs remove, and a later full_proxy_release() > won't call anything anyway - this just crashed/UAFed because it > used real_fops, not because there was actually a (now invalid) > release() method. I actually implemented something a bit better than what I described - we never need a reference to the real_fops for the release method alone, and that means if the release method is in the kernel image, rather than a module, it can still be called. That together should reduce the ~117 places you changed in the large patchset to around a handful. johannes
