watchdog: lenovo_se30_wdt: Fix possible devm_ioremap() NULL pointer dereference in...

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@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20250424071648.89016-1-bsdhenrymartin@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

diff --git a/drivers/watchdog/lenovo_se30_wdt.c b/drivers/watchdog/lenovo_se30_wdt.c
index 024b842..1c73bb7 100644 (file)
--- 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;