linux-kernel - [PATCH] drivers/misc: Add NULL check in aspeed_lpc_enable

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Message-Id: <20250331093922.7735-1-bsdhenrymartin@gmail.com>
Date: Mon, 31 Mar 2025 17:39:22 +0800
From: Henry Martin <bsdhenrymartin@...il.com>
To: joel@....id.au,
	andrew@...econstruct.com.au
Cc: herve.codina@...tlin.com,
	gsomlo@...il.com,
	heiko@...ech.de,
	andersson@...nel.org,
	u.kleine-koenig@...libre.com,
	bsdhenrymartin@...il.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-aspeed@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drivers/misc: Add NULL check in aspeed_lpc_enable_snoop

When devm_kasprintf() fails, it returns a NULL pointer. However, this return value is not properly checked in the function aspeed_lpc_enable_snoop.

A NULL check should be added after the devm_kasprintf() to prevent potential NULL pointer dereference error.

Fixes: 3772e5da44542 ("Aspeed LPC snoop output using misc chardev")

Signed-off-by: Henry Martin <bsdhenrymartin@...il.com>
---
 drivers/soc/aspeed/aspeed-lpc-snoop.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/soc/aspeed/aspeed-lpc-snoop.c b/drivers/soc/aspeed/aspeed-lpc-snoop.c
index 9ab5ba9cf1d6..376b3a910797 100644
--- a/drivers/soc/aspeed/aspeed-lpc-snoop.c
+++ b/drivers/soc/aspeed/aspeed-lpc-snoop.c
@@ -200,6 +200,8 @@ static int aspeed_lpc_enable_snoop(struct aspeed_lpc_snoop *lpc_snoop,
 	lpc_snoop->chan[channel].miscdev.minor = MISC_DYNAMIC_MINOR;
 	lpc_snoop->chan[channel].miscdev.name =
 		devm_kasprintf(dev, GFP_KERNEL, "%s%d", DEVICE_NAME, channel);
+	if (!lpc_snoop->chan[channel].miscdev.name)
+		return -ENOMEM;
 	lpc_snoop->chan[channel].miscdev.fops = &snoop_fops;
 	lpc_snoop->chan[channel].miscdev.parent = dev;
 	rc = misc_register(&lpc_snoop->chan[channel].miscdev);
-- 
2.34.1