binder: fix handling of misaligned binder object

mainline inclusion
from mainline-v5.1-rc1
commit 26528be6
category: bugfix
bugzilla: 188431, https://gitee.com/src-openeuler/kernel/issues/I6DKVG
CVE: CVE-2023-20938

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=26528be6720bb40bc8844e97ee73a37e530e9c5e



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

Fixes crash found by syzbot:
kernel BUG at drivers/android/binder_alloc.c:LINE! (2)

Reported-and-tested-by:  <syzbot+55de1eb4975dec156d8f@syzkaller.appspotmail.com>
Signed-off-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Li Huafei <lihuafei1@huawei.com>
Reviewed-by: Zheng Yejian <zhengyejian1@huawei.com>
Reviewed-by: Wang Weiyang <wangweiyang2@huawei.com>
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>