linux-kernel - [PATCH v2] usb/gadget: Add NULL check in ast_vhub_init

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Message-Id: <20250405113020.80387-1-bsdhenrymartin@gmail.com>
Date: Sat,  5 Apr 2025 19:30:20 +0800
From: Henry Martin <bsdhenrymartin@...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,
	Henry Martin <bsdhenrymartin@...il.com>,
	stable@...r.kernel.org
Subject: [PATCH v2] usb/gadget: Add NULL check in ast_vhub_init_dev()

devm_kasprintf() returns NULL when memory allocation fails. Currently,
ast_vhub_init_dev() does not check for this case, which results in a
NULL pointer dereference.

Add NULL check after devm_kasprintf() to prevent this issue.

Cc: stable@...r.kernel.org	# v4.18
Fixes: 7ecca2a4080c ("usb/gadget: Add driver for Aspeed SoC virtual hub")
Signed-off-by: Henry Martin <bsdhenrymartin@...il.com>
---
V1 -> V2: Add Cc: stable label and correct commit message.

 drivers/usb/gadget/udc/aspeed-vhub/dev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/gadget/udc/aspeed-vhub/dev.c b/drivers/usb/gadget/udc/aspeed-vhub/dev.c
index 573109ca5b79..5b7d41a990d7 100644
--- a/drivers/usb/gadget/udc/aspeed-vhub/dev.c
+++ b/drivers/usb/gadget/udc/aspeed-vhub/dev.c
@@ -548,6 +548,8 @@ 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