linux-kernel - [PATCH v2] usb: gadget: udc: replace kzalloc with devm_kzalloc in mv_udc_probe and add a check for this allocation.

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Date:   Fri, 24 Feb 2023 22:31:48 +0800
From:   void0red <void0red@...il.com>
To:     mudongliangabcd@...il.com
Cc:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, Kang Chen <void0red@...il.com>
Subject: [PATCH v2] usb: gadget: udc: replace kzalloc with devm_kzalloc in mv_udc_probe and add a check for this allocation.

From: Kang Chen <void0red@...il.com>

This driver uses the unified memory management api, so replace
kzalloc with devm_kzalloc to avoid a memory leak and add a check
for this allocation.

Reported-by: eriri <1527030098@...com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217081

Signed-off-by: Kang Chen <void0red@...il.com>
---
v2 -> v1: replace kzalloc with devm_kzalloc

 drivers/usb/gadget/udc/mv_udc_core.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/mv_udc_core.c b/drivers/usb/gadget/udc/mv_udc_core.c
index b397f3a84..08474c08d 100644
--- a/drivers/usb/gadget/udc/mv_udc_core.c
+++ b/drivers/usb/gadget/udc/mv_udc_core.c
@@ -2229,7 +2229,11 @@ static int mv_udc_probe(struct platform_device *pdev)
 	INIT_LIST_HEAD(&udc->status_req->queue);
 
 	/* allocate a small amount of memory to get valid address */
-	udc->status_req->req.buf = kzalloc(8, GFP_KERNEL);
+	udc->status_req->req.buf = devm_kzalloc(&pdev->dev, 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