linux-kernel - [PATCH] usb: gadget: udc: add return value check of kzalloc in mv_udc

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Message-Id: <20230224080842.3104911-1-void0red@gmail.com>
Date:   Fri, 24 Feb 2023 16:08:42 +0800
From:   void0red <void0red@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        void0red <void0red@...il.com>
Subject: [PATCH] usb: gadget: udc: add return value check of kzalloc in mv_udc_probe

Even an 8-byte kzalloc will fail when we don't have enough memory,
so we need a nullptr check and do the cleanup when it fails.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=217081

Signed-off-by: void0red <void0red@...il.com>
---
 drivers/usb/gadget/udc/mv_udc_core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/gadget/udc/mv_udc_core.c b/drivers/usb/gadget/udc/mv_udc_core.c
index b397f3a84..6dd6d52de 100644
--- a/drivers/usb/gadget/udc/mv_udc_core.c
+++ b/drivers/usb/gadget/udc/mv_udc_core.c
@@ -2230,6 +2230,10 @@ static int mv_udc_probe(struct platform_device *pdev)
 
 	/* allocate a small amount of memory to get valid address */
 	udc->status_req->req.buf = kzalloc(8, GFP_KERNEL);
+	if (!udc->status_req->req.buf) {
+		retval = -ENOMEM;
+		goto err_destroy_dma;
+	}
 	udc->status_req->req.dma = DMA_ADDR_INVALID;
 
 	udc->resume_state = USB_STATE_NOTATTACHED;
-- 
2.34.1