From 5376e3d904532e657fd7ca1a9b1ff3d351527b90 Mon Sep 17 00:00:00 2001
From: Yang Yingliang <yangyingliang@huawei.com>
Date: Fri, 29 Apr 2022 16:26:36 +0800
Subject: [PATCH] pinctrl: renesas: core: Fix possible null-ptr-deref in sh_pfc_map_resources()
Git-commit: 5376e3d904532e657fd7ca1a9b1ff3d351527b90
Patch-mainline: v5.19-rc1
References: git-fixes

It will cause null-ptr-deref when using 'res', if platform_get_resource()
returns NULL, so move using 'res' after devm_ioremap_resource() that
will check it to avoid null-ptr-deref.
And use devm_platform_get_and_ioremap_resource() to simplify code.

Fixes: c7977ec4a336 ("pinctrl: sh-pfc: Convert to platform_get_*()")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20220429082637.1308182-1-yangyingliang@huawei.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/pinctrl/renesas/core.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/pinctrl/renesas/core.c b/drivers/pinctrl/renesas/core.c
index 220a08312c3c..f05991eea27f 100644
--- a/drivers/pinctrl/renesas/core.c
+++ b/drivers/pinctrl/renesas/core.c
@@ -71,12 +71,11 @@ static int sh_pfc_map_resources(struct sh_pfc *pfc,
 
 	/* Fill them. */
 	for (i = 0; i < num_windows; i++) {
-		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
-		windows->phys = res->start;
-		windows->size = resource_size(res);
-		windows->virt = devm_ioremap_resource(pfc->dev, res);
+		windows->virt = devm_platform_get_and_ioremap_resource(pdev, i, &res);
 		if (IS_ERR(windows->virt))
 			return -ENOMEM;
+		windows->phys = res->start;
+		windows->size = resource_size(res);
 		windows++;
 	}
 	for (i = 0; i < num_irqs; i++)
-- 
2.35.3