From 382c90f53b40f358647e6ef26472545a30e90a5d Mon Sep 17 00:00:00 2001 From: Martijn Coenen Date: Fri, 5 Jan 2018 11:27:07 +0100 Subject: [PATCH] UPSTREAM: ANDROID: binder: remove waitqueue when thread exits. binder_poll() passes the thread->wait waitqueue that can be slept on for work. When a thread that uses epoll explicitly exits using BINDER_THREAD_EXIT, the waitqueue is freed, but it is never removed from the corresponding epoll data structure. When the process subsequently exits, the epoll cleanup code tries to access the waitlist, which results in a use-after-free. Prevent this by using POLLFREE when the thread exits. (cherry picked from commit f5cb779ba16334b45ba8946d6bfa6d9834d1527f) Change-Id: Ib34b1cbb8ab2192d78c3d9956b2f963a66ecad2e Signed-off-by: Martijn Coenen Reported-by: syzbot Cc: stable # 4.14 Signed-off-by: Greg Kroah-Hartman --- drivers/android/binder.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/android/binder.c b/drivers/android/binder.c index f1e64f00d45..f4aaae464c4 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -4529,6 +4529,18 @@ static int binder_thread_release(struct binder_proc *proc, if (t) spin_lock(&t->lock); } + + /* + * If this thread used poll, make sure we remove the waitqueue + * from any epoll data structures holding it with POLLFREE. + * waitqueue_active() is safe to use here because we're holding + * the inner lock. + */ + if ((thread->looper & BINDER_LOOPER_STATE_POLL) && + waitqueue_active(&thread->wait)) { + wake_up_poll(&thread->wait, POLLHUP | POLLFREE); + } + binder_inner_proc_unlock(thread->proc); if (send_reply) -- 2.20.1