linux-kernel - [PATCH] usb: gadget: aspeed_udc: Add check for dma_alloc

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Message-Id: <20221213025120.23149-1-jiasheng@iscas.ac.cn>
Date:   Tue, 13 Dec 2022 10:51:19 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     neal_liu@...eedtech.com, gregkh@...uxfoundation.org,
        joel@....id.au, andrew@...id.au, sumit.semwal@...aro.org,
        christian.koenig@....com
Cc:     linux-aspeed@...ts.ozlabs.org, linux-usb@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] usb: gadget: aspeed_udc: Add check for dma_alloc_coherent

Add the check for the return value of dma_alloc_coherent
in order to avoid NULL pointer dereference.

Fixes: 055276c13205 ("usb: gadget: add Aspeed ast2600 udc driver")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/usb/gadget/udc/aspeed_udc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/gadget/udc/aspeed_udc.c b/drivers/usb/gadget/udc/aspeed_udc.c
index 01968e2167f9..6cf46562bb25 100644
--- a/drivers/usb/gadget/udc/aspeed_udc.c
+++ b/drivers/usb/gadget/udc/aspeed_udc.c
@@ -1516,6 +1516,8 @@ static int ast_udc_probe(struct platform_device *pdev)
 					  AST_UDC_EP_DMA_SIZE *
 					  AST_UDC_NUM_ENDPOINTS,
 					  &udc->ep0_buf_dma, GFP_KERNEL);
+	if (!udc->ep0_buf)
+		return -ENOMEM;
 
 	udc->gadget.speed = USB_SPEED_UNKNOWN;
 	udc->gadget.max_speed = USB_SPEED_HIGH;
-- 
2.25.1