There are commits in the 4.14, 4.19 and 5.0 stable branches that claim to be backports of:
commit 26528be6720bb40bc8844e97ee73a37e530e9c5e Author: Todd Kjos tkjos@android.com Date: Thu Feb 14 15:22:57 2019 -0800
binder: fix handling of misaligned binder object
However the source changes actually match:
commit 5cec2d2e5839f9c0fec319c523a911e0a7fd299f Author: Todd Kjos tkjos@android.com Date: Fri Mar 1 15:06:06 2019 -0800
binder: fix race between munmap() and direct reclaim
So far as I can see, the former fixes a bug only introduced in 5.1 and the latter fixes an older bug, so the changes are correct and only the metadata is not.
Similar mix-ups have happened before and I'm a little disturbed that this keeps happening. In any case, you may want to revert and re-apply with correct metadata.
Ben.