Merge tag 'staging-5.15-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging driver fixes from Greg KH:
 "Here are two small staging driver fixes for 5.15-rc3:

   - greybus tty use-after-free bugfix

   - r8188eu ioctl overlap build warning fix

  Note, the r8188eu ioctl has been entirely removed for 5.16-rc1, but
  it's good to get this fixed now for people using this in 5.15.

  Both of these have been in linux-next for a while with no reported
  issues"

* tag 'staging-5.15-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging: r8188eu: fix -Wrestrict warnings
  staging: greybus: uart: fix tty use after free

2 files changed, 36 insertions, 34 deletions

diff --git a/drivers/staging/greybus/uart.c b/drivers/staging/greybus/uart.c
index e6d860a9678e..dc4ed0ff1ae2 100644
--- a/drivers/staging/greybus/uart.c
+++ b/drivers/staging/greybus/uart.c
@@ -761,6 +761,17 @@ out:
 	gbphy_runtime_put_autosuspend(gb_tty->gbphy_dev);
 }
 
+static void gb_tty_port_destruct(struct tty_port *port)
+{
+	struct gb_tty *gb_tty = container_of(port, struct gb_tty, port);
+
+	if (gb_tty->minor != GB_NUM_MINORS)
+		release_minor(gb_tty);
+	kfifo_free(&gb_tty->write_fifo);
+	kfree(gb_tty->buffer);
+	kfree(gb_tty);
+}
+
 static const struct tty_operations gb_ops = {
 	.install =		gb_tty_install,
 	.open =			gb_tty_open,
@@ -786,6 +797,7 @@ static const struct tty_port_operations gb_port_ops = {
 	.dtr_rts =		gb_tty_dtr_rts,
 	.activate =		gb_tty_port_activate,
 	.shutdown =		gb_tty_port_shutdown,
+	.destruct =		gb_tty_port_destruct,
 };
 
 static int gb_uart_probe(struct gbphy_device *gbphy_dev,
@@ -798,17 +810,11 @@ static int gb_uart_probe(struct gbphy_device *gbphy_dev,
 	int retval;
 	int minor;
 
-	gb_tty = kzalloc(sizeof(*gb_tty), GFP_KERNEL);
-	if (!gb_tty)
-		return -ENOMEM;
-
 	connection = gb_connection_create(gbphy_dev->bundle,
 					  le16_to_cpu(gbphy_dev->cport_desc->id),
 					  gb_uart_request_handler);
-	if (IS_ERR(connection)) {
-		retval = PTR_ERR(connection);
-		goto exit_tty_free;
-	}
+	if (IS_ERR(connection))
+		return PTR_ERR(connection);
 
 	max_payload = gb_operation_get_payload_size_max(connection);
 	if (max_payload < sizeof(struct gb_uart_send_data_request)) {
@@ -816,13 +822,23 @@ static int gb_uart_probe(struct gbphy_device *gbphy_dev,
 		goto exit_connection_destroy;
 	}
 
+	gb_tty = kzalloc(sizeof(*gb_tty), GFP_KERNEL);
+	if (!gb_tty) {
+		retval = -ENOMEM;
+		goto exit_connection_destroy;
+	}
+
+	tty_port_init(&gb_tty->port);
+	gb_tty->port.ops = &gb_port_ops;
+	gb_tty->minor = GB_NUM_MINORS;
+
 	gb_tty->buffer_payload_max = max_payload -
 			sizeof(struct gb_uart_send_data_request);
 
 	gb_tty->buffer = kzalloc(gb_tty->buffer_payload_max, GFP_KERNEL);
 	if (!gb_tty->buffer) {
 		retval = -ENOMEM;
-		goto exit_connection_destroy;
+		goto exit_put_port;
 	}
 
 	INIT_WORK(&gb_tty->tx_work, gb_uart_tx_write_work);
@@ -830,7 +846,7 @@ static int gb_uart_probe(struct gbphy_device *gbphy_dev,
 	retval = kfifo_alloc(&gb_tty->write_fifo, GB_UART_WRITE_FIFO_SIZE,
 			     GFP_KERNEL);
 	if (retval)
-		goto exit_buf_free;
+		goto exit_put_port;
 
 	gb_tty->credits = GB_UART_FIRMWARE_CREDITS;
 	init_completion(&gb_tty->credits_complete);
@@ -844,7 +860,7 @@ static int gb_uart_probe(struct gbphy_device *gbphy_dev,
 		} else {
 			retval = minor;
 		}
-		goto exit_kfifo_free;
+		goto exit_put_port;
 	}
 
 	gb_tty->minor = minor;
@@ -853,9 +869,6 @@ static int gb_uart_probe(struct gbphy_device *gbphy_dev,
 	init_waitqueue_head(&gb_tty->wioctl);
 	mutex_init(&gb_tty->mutex);
 
-	tty_port_init(&gb_tty->port);
-	gb_tty->port.ops = &gb_port_ops;
-
 	gb_tty->connection = connection;
 	gb_tty->gbphy_dev = gbphy_dev;
 	gb_connection_set_data(connection, gb_tty);
@@ -863,7 +876,7 @@ static int gb_uart_probe(struct gbphy_device *gbphy_dev,
 
 	retval = gb_connection_enable_tx(connection);
 	if (retval)
-		goto exit_release_minor;
+		goto exit_put_port;
 
 	send_control(gb_tty, gb_tty->ctrlout);
 
@@ -890,16 +903,10 @@ static int gb_uart_probe(struct gbphy_device *gbphy_dev,
 
 exit_connection_disable:
 	gb_connection_disable(connection);
-exit_release_minor:
-	release_minor(gb_tty);
-exit_kfifo_free:
-	kfifo_free(&gb_tty->write_fifo);
-exit_buf_free:
-	kfree(gb_tty->buffer);
+exit_put_port:
+	tty_port_put(&gb_tty->port);
 exit_connection_destroy:
 	gb_connection_destroy(connection);
-exit_tty_free:
-	kfree(gb_tty);
 
 	return retval;
 }
@@ -930,15 +937,10 @@ static void gb_uart_remove(struct gbphy_device *gbphy_dev)
 	gb_connection_disable_rx(connection);
 	tty_unregister_device(gb_tty_driver, gb_tty->minor);
 
-	/* FIXME - free transmit / receive buffers */
-
 	gb_connection_disable(connection);
-	tty_port_destroy(&gb_tty->port);
 	gb_connection_destroy(connection);
-	release_minor(gb_tty);
-	kfifo_free(&gb_tty->write_fifo);
-	kfree(gb_tty->buffer);
-	kfree(gb_tty);
+
+	tty_port_put(&gb_tty->port);
 }
 
 static int gb_tty_init(void)
diff --git a/drivers/staging/r8188eu/os_dep/ioctl_linux.c b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
index 81d4255d1785..1fd375076001 100644
--- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c
+++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
@@ -5372,8 +5372,8 @@ static int rtw_mp_read_reg(struct net_device *dev,
 
 			pnext++;
 			if (*pnext != '\0') {
-				  strtout = simple_strtoul(pnext, &ptmp, 16);
-				  sprintf(extra, "%s %d", extra, strtout);
+				strtout = simple_strtoul(pnext, &ptmp, 16);
+				sprintf(extra + strlen(extra), " %d", strtout);
 			} else {
 				  break;
 			}
@@ -5405,7 +5405,7 @@ static int rtw_mp_read_reg(struct net_device *dev,
 			pnext++;
 			if (*pnext != '\0') {
 				strtout = simple_strtoul(pnext, &ptmp, 16);
-				sprintf(extra, "%s %d", extra, strtout);
+				sprintf(extra + strlen(extra), " %d", strtout);
 			} else {
 				break;
 			}
@@ -5512,7 +5512,7 @@ static int rtw_mp_read_rf(struct net_device *dev,
 		pnext++;
 		if (*pnext != '\0') {
 			  strtou = simple_strtoul(pnext, &ptmp, 16);
-			  sprintf(extra, "%s %d", extra, strtou);
+			  sprintf(extra + strlen(extra), " %d", strtou);
 		} else {
 			  break;
 		}