ANDROID: binder: Clear binder and cookie when setting handle in flat binder struct

commit 4afb604e upstream.

Prevents leaking pointers between processes
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Martijn Coenen <maco@android.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

drivers/staging/android/binder.c

@@ -1541,7 +1541,9 @@ static void binder_transaction(struct binder_proc *proc,
 				fp->type = BINDER_TYPE_HANDLE;
 			else
 				fp->type = BINDER_TYPE_WEAK_HANDLE;
+			fp->binder = NULL;
 			fp->handle = ref->desc;
+			fp->cookie = NULL;
 			binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE,
 				       &thread->todo);
 
@@ -1584,7 +1586,9 @@ static void binder_transaction(struct binder_proc *proc,
 					return_error = BR_FAILED_REPLY;
 					goto err_binder_get_ref_for_node_failed;
 				}
+				fp->binder = NULL;
 				fp->handle = new_ref->desc;
+				fp->cookie = NULL;
 				binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
 				trace_binder_transaction_ref_to_ref(t, ref,
 								    new_ref);
@@ -1631,6 +1635,7 @@ static void binder_transaction(struct binder_proc *proc,
 			binder_debug(BINDER_DEBUG_TRANSACTION,
 				     "        fd %d -> %d\n", fp->handle, target_fd);
 			/* TODO: fput? */
+			fp->binder = NULL;
 			fp->handle = target_fd;
 		} break;