UPSTREAM: binder: Return EFAULT if we fail BINDER_ENABLE_ONEWAY_SPAM_DETECTION

All the other ioctl paths return EFAULT in case the
copy_from_user/copy_to_user call fails, make oneway spam detection
follow the same paradigm.

Fixes: a7dc1e6f99df ("binder: tell userspace to dump current backtrace when detected oneway spamming")
Acked-by: Todd Kjos <tkjos@google.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Luca Stefani <luca.stefani.ge1@gmail.com>
Link: https://lore.kernel.org/r/20210506193726.45118-1-luca.stefani.ge1@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit ced081a436d21a7d34d4d42acb85058f9cf423f2)
Bug: 187129171
Signed-off-by: Connor O'Brien <connoro@google.com>
Change-Id: I7c5e6ec7108c42721de6c82f4c1e9ff3d4f0e88d

drivers/android/binder.c

@@ -5306,7 +5306,7 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		uint32_t enable;
 
 		if (copy_from_user(&enable, ubuf, sizeof(enable))) {
-			ret = -EINVAL;
+			ret = -EFAULT;
 			goto err;
 		}
 		binder_inner_proc_lock(proc);