linux-kernel - [PATCH] usb: gadget: aspeed: Add NULL pointer check in ast_vhub_init

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Message-Id: <20250311012705.1233829-1-chenyuan0y@gmail.com>
Date: Mon, 10 Mar 2025 20:27:05 -0500
From: Chenyuan Yang <chenyuan0y@...il.com>
To: gregkh@...uxfoundation.org,
	joel@....id.au,
	andrew@...econstruct.com.au
Cc: linux-usb@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-aspeed@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	Chenyuan Yang <chenyuan0y@...il.com>
Subject: [PATCH] usb: gadget: aspeed: Add NULL pointer check in ast_vhub_init_dev()

The variable d->name, returned by devm_kasprintf(), could be NULL.
A pointer check is added to prevent potential NULL pointer dereference.
This is similar to the fix in commit 3027e7b15b02
("ice: Fix some null pointer dereference issues in ice_ptp.c").

This issue is found by our static analysis tool

Signed-off-by: Chenyuan Yang <chenyuan0y@...il.com>
---
 drivers/usb/gadget/udc/aspeed-vhub/dev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/gadget/udc/aspeed-vhub/dev.c b/drivers/usb/gadget/udc/aspeed-vhub/dev.c
index 573109ca5b79..a09f72772e6e 100644
--- a/drivers/usb/gadget/udc/aspeed-vhub/dev.c
+++ b/drivers/usb/gadget/udc/aspeed-vhub/dev.c
@@ -548,6 +548,9 @@ int ast_vhub_init_dev(struct ast_vhub *vhub, unsigned int idx)
 	d->vhub = vhub;
 	d->index = idx;
 	d->name = devm_kasprintf(parent, GFP_KERNEL, "port%d", idx+1);
+	if (!d->name)
+		return -ENOMEM;
+
 	d->regs = vhub->regs + 0x100 + 0x10 * idx;
 
 	ast_vhub_init_ep0(vhub, &d->ep0, d);
-- 
2.34.1