linux-kernel - [PATCH AUTOSEL 5.10 07/30] staging: emxx_udc: Add checks for dma_alloc

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Date:   Fri,  3 Mar 2023 16:46:52 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yuan Can <yuancan@...wei.com>, Simon Horman <horms@...ge.net.au>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, drv@...lo.com,
        linux-staging@...ts.linux.dev
Subject: [PATCH AUTOSEL 5.10 07/30] staging: emxx_udc: Add checks for dma_alloc_coherent()

From: Yuan Can <yuancan@...wei.com>

[ Upstream commit f6510a93cfd8c6c79b4dda0f2967cdc6df42eff4 ]

As the dma_alloc_coherent may return NULL, the return value needs to be
checked to avoid NULL poineter dereference.

Signed-off-by: Yuan Can <yuancan@...wei.com>
Reviewed-by: Simon Horman <horms@...ge.net.au>
Link: https://lore.kernel.org/r/20230119083119.16956-1-yuancan@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/emxx_udc/emxx_udc.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/emxx_udc/emxx_udc.c b/drivers/staging/emxx_udc/emxx_udc.c
index 3897f8e8f5e0d..6870a33d4ccf3 100644
--- a/drivers/staging/emxx_udc/emxx_udc.c
+++ b/drivers/staging/emxx_udc/emxx_udc.c
@@ -2591,10 +2591,15 @@ static int nbu2ss_ep_queue(struct usb_ep *_ep,
 		req->unaligned = false;
 
 	if (req->unaligned) {
-		if (!ep->virt_buf)
+		if (!ep->virt_buf) {
 			ep->virt_buf = dma_alloc_coherent(udc->dev, PAGE_SIZE,
 							  &ep->phys_buf,
 							  GFP_ATOMIC | GFP_DMA);
+			if (!ep->virt_buf) {
+				spin_unlock_irqrestore(&udc->lock, flags);
+				return -ENOMEM;
+			}
+		}
 		if (ep->epnum > 0)  {
 			if (ep->direct == USB_DIR_IN)
 				memcpy(ep->virt_buf, req->req.buf,
-- 
2.39.2