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rust_binder: freeze_notif_done should resend if wrong state

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Consider the following scenario:
1. A freeze notification is delivered to thread 1.
2. The process becomes frozen or unfrozen.
3. The message for step 2 is delivered to thread 2 and ignored because
   there is already a pending notification from step 1.
4. Thread 1 acknowledges the notification from step 1.
In this case, step 4 should ensure that the message ignored in step 3 is
resent as it can now be delivered.

Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Acked-by: Carlos Llamas <cmllamas@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alice Ryhl 2025-10-07 09:39:51 +00:00 committed by Greg Kroah-Hartman
parent c7c090af37
commit bfe144da06
1 changed files with 3 additions and 2 deletions
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5
drivers/android/binder/freeze.rs
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@ -245,8 +245,9 @@ pub(crate) fn freeze_notif_done(self: &Arc<Self>, reader: &mut UserSliceReader)
);
return Err(EINVAL);
}
if freeze.is_clearing {
// Immediately send another FreezeMessage for BR_CLEAR_FREEZE_NOTIFICATION_DONE.
let is_frozen = freeze.node.owner.inner.lock().is_frozen;
if freeze.is_clearing || freeze.last_is_frozen != Some(is_frozen) {
// Immediately send another FreezeMessage.
clear_msg = Some(FreezeMessage::init(alloc, cookie));
}
freeze.is_pending = false;