From: Lee Jones Subject: [PATCH 23/39] usb: musb: ux500: harden checks for platform data Date: Wed, 15 May 2013 10:51:46 +0100 Message-ID: <1368611522-9984-24-git-send-email-lee.jones@linaro.org> References: <1368611522-9984-1-git-send-email-lee.jones@linaro.org> Cc: arnd@arndb.de, linus.walleij@stericsson.com, srinidhi.kasagar@stericsson.com, Lee Jones To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, balbi@ti.com, linux-usb@vger.kernel.org, linux-crypto@vger.kernel.org, davem@davemloft.net, herbert@gondor.apana.org.au, vinod.koul@intel.com Return-path: In-Reply-To: <1368611522-9984-1-git-send-email-lee.jones@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org 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 Cc: linux-usb@vger.kernel.org Acked-by: Fabio Baltieri Signed-off-by: Lee Jones --- drivers/usb/musb/ux500_dma.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/usb/musb/ux500_dma.c b/drivers/usb/musb/ux500_dma.c index 382291b..4bd5400 100644 --- a/drivers/usb/musb/ux500_dma.c +++ b/drivers/usb/musb/ux500_dma.c @@ -289,7 +289,7 @@ 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; @@ -299,14 +299,19 @@ 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; @@ -339,7 +344,7 @@ 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; } -- 1.7.10.4