From: Fabio Estevam <fabio.estevam@nxp.com>
Date: Sat, 22 Jul 2017 16:04:33 +0000 (-0300)
Subject: watchdog: qcom: Check for platform_get_resource() failure
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=15210ad18fcbd7f53f40e26e4391710d271c2daf;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

watchdog: qcom: Check for platform_get_resource() failure

platform_get_resource() may fail, so we should better check its
return value and propagate an error in case it fails.

This avoids a NULL pointer dereference a bit later in the code.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
---

diff --git a/drivers/watchdog/qcom-wdt.c b/drivers/watchdog/qcom-wdt.c
index 4f47b5e90956..780971318810 100644
--- a/drivers/watchdog/qcom-wdt.c
+++ b/drivers/watchdog/qcom-wdt.c
@@ -162,6 +162,8 @@ static int qcom_wdt_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENOMEM;
 
 	/* We use CPU0's DGT for the watchdog */
 	if (of_property_read_u32(np, "cpu-offset", &percpu_offset))