[PATCH 5.15 209/484] binder: fix hang of unregistered readers

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5.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Carlos Llamas <cmllamas@xxxxxxxxxx>

commit 31643d84b8c3d9c846aa0e20bc033e46c68c7e7d upstream.

With the introduction of binder_available_for_proc_work_ilocked() in
commit 1b77e9dcc3da ("ANDROID: binder: remove proc waitqueue") a binder
thread can only "wait_for_proc_work" after its thread->looper has been
marked as BINDER_LOOPER_STATE_{ENTERED|REGISTERED}.

This means an unregistered reader risks waiting indefinitely for work
since it never gets added to the proc->waiting_threads. If there are no
further references to its waitqueue either the task will hang. The same
applies to readers using the (e)poll interface.

I couldn't find the rationale behind this restriction. So this patch
restores the previous behavior of allowing unregistered threads to
"wait_for_proc_work". Note that an error message for this scenario,
which had previously become unreachable, is now re-enabled.

Fixes: 1b77e9dcc3da ("ANDROID: binder: remove proc waitqueue")
Cc: stable@xxxxxxxxxxxxxxx
Cc: Martijn Coenen <maco@xxxxxxxxxx>
Cc: Arve Hjønnevåg <arve@xxxxxxxxxx>
Signed-off-by: Carlos Llamas <cmllamas@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240711201452.2017543-1-cmllamas@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/android/binder.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -542,9 +542,7 @@ static bool binder_has_work(struct binde
 static bool binder_available_for_proc_work_ilocked(struct binder_thread *thread)
 {
 	return !thread->transaction_stack &&
-		binder_worklist_empty_ilocked(&thread->todo) &&
-		(thread->looper & (BINDER_LOOPER_STATE_ENTERED |
-				   BINDER_LOOPER_STATE_REGISTERED));
+		binder_worklist_empty_ilocked(&thread->todo);
 }
 
 static void binder_wakeup_poll_threads_ilocked(struct binder_proc *proc,






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