linux-kernel - [PATCH] usb: gadget: udc: mv_udc

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Message-Id: <20211223024734.1236009-1-jiasheng@iscas.ac.cn>
Date:   Thu, 23 Dec 2021 10:47:34 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     gregkh@...uxfoundation.org, rafael@...nel.org
Cc:     linux-kernel@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] usb: gadget: udc: mv_udc_core: Check error dma address

Because the dma_map_single() might return error dma address if fails.
Therefore it might be better to check the address in order to avoid the
use of error dma address in build_dtd() which is called by req_to_dtd().

Fixes: 90fccb529d24 ("usb: gadget: Gadget directory cleanup - group UDC drivers")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/usb/gadget/udc/mv_udc_core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/gadget/udc/mv_udc_core.c b/drivers/usb/gadget/udc/mv_udc_core.c
index 0fb4ef464321..2613dbdc5aba 100644
--- a/drivers/usb/gadget/udc/mv_udc_core.c
+++ b/drivers/usb/gadget/udc/mv_udc_core.c
@@ -1472,6 +1472,9 @@ udc_prime_status(struct mv_udc *udc, u8 direction, u16 status, bool empty)
 		req->req.dma = dma_map_single(ep->udc->gadget.dev.parent,
 				req->req.buf, req->req.length,
 				ep_dir(ep) ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+		retval = dma_mapping_error(ep->udc->gadget.dev.parent, req->req.dma);
+		if (retval)
+			goto out;
 		req->mapped = 1;
 	}
 
-- 
2.25.1