[PATCH 04/10 v2] usb: musb: ux500: harden checks for platform data

[Lee Jones]

In its current state, the ux500-musb driver uses platform data pointers
blindly with no prior checking. If no platform data pointer is passed
this will Oops the kernel. In this patch we ensure platform data and
board data are present prior to using them.

Cc: Felipe Balbi <balbi at ti.com>
Cc: linux-usb at vger.kernel.org
Signed-off-by: Lee Jones <lee.jones at linaro.org>

diff --git a/drivers/usb/musb/ux500_dma.c b/drivers/usb/musb/ux500_dma.c
index c75e07a..8d5128d 100644
--- a/drivers/usb/musb/ux500_dma.c
+++ b/drivers/usb/musb/ux500_dma.c
@@ -287,7 +287,7 @@ static int ux500_dma_controller_start(struct dma_controller *c)
 	struct musb *musb = controller->private_data;
 	struct device *dev = musb->controller;
 	struct musb_hdrc_platform_data *plat = dev->platform_data;
-	struct ux500_musb_board_data *data = plat->board_data;
+	struct ux500_musb_board_data *data;
 	struct dma_channel *dma_channel = NULL;
 	u32 ch_num;
 	u8 dir;
@@ -297,14 +297,19 @@ static int ux500_dma_controller_start(struct dma_controller *c)
 	struct ux500_dma_channel *channel_array;
 	dma_cap_mask_t mask;
 
+	if (!plat) {
+		dev_err(musb->controller, "No platform data\n");
+		return -EINVAL;
+	}
 
+	data = plat->board_data;
 
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 
 	/* Prepare the loop for RX channels */
 	channel_array = controller->rx_channel;
-	param_array = data->dma_rx_param_array;
+	param_array = data ? data->dma_rx_param_array : NULL;
 
 	for (dir = 0; dir < 2; dir++) {
 		for (ch_num = 0;
@@ -337,7 +342,7 @@ static int ux500_dma_controller_start(struct dma_controller *c)
 
 		/* Prepare the loop for TX channels */
 		channel_array = controller->tx_channel;
-		param_array = data->dma_tx_param_array;
+		param_array = data ? data->dma_tx_param_array : NULL;
 		is_tx = 1;
 	}