linux-kernel - [PATCH v1] watchdog: lenovo_se30_wdt: Fix null-ptr-deref in lenovo_se30_wdt

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Message-Id: <20250424071648.89016-1-bsdhenrymartin@gmail.com>
Date: Thu, 24 Apr 2025 15:16:48 +0800
From: Henry Martin <bsdhenrymartin@...il.com>
To: wim@...ux-watchdog.org,
	linux@...ck-us.net
Cc: linux-watchdog@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Henry Martin <bsdhenrymartin@...il.com>
Subject: [PATCH v1] watchdog: lenovo_se30_wdt: Fix null-ptr-deref in lenovo_se30_wdt_probe()

devm_ioremap() returns NULL on error. Currently, lenovo_se30_wdt_probe()
does not check for this case, which results in a NULL pointer
dereference.

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

Fixes: c284153a2c55 ("watchdog: lenovo_se30_wdt: Watchdog driver for Lenovo SE30 platform")
Signed-off-by: Henry Martin <bsdhenrymartin@...il.com>
---
 drivers/watchdog/lenovo_se30_wdt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/watchdog/lenovo_se30_wdt.c b/drivers/watchdog/lenovo_se30_wdt.c
index 024b842499b3..1c73bb7eeeee 100644
--- a/drivers/watchdog/lenovo_se30_wdt.c
+++ b/drivers/watchdog/lenovo_se30_wdt.c
@@ -271,6 +271,8 @@ static int lenovo_se30_wdt_probe(struct platform_device *pdev)
 		return -EBUSY;
 
 	priv->shm_base_addr = devm_ioremap(dev, base_phys, SHM_WIN_SIZE);
+	if (!priv->shm_base_addr)
+		return -ENOMEM;
 
 	priv->wdt_cfg.mod = WDT_MODULE;
 	priv->wdt_cfg.idx = WDT_CFG_INDEX;
-- 
2.34.1