From 26e784433e6c65735cd6d93a8db52531970d9a60 Mon Sep 17 00:00:00 2001
From: William Dean <williamsukatube@gmail.com>
Date: Fri, 22 Jul 2022 17:16:44 +0800
Subject: [PATCH] mtd: devices: docg3: check the return value of devm_ioremap() in the probe
Git-commit: 26e784433e6c65735cd6d93a8db52531970d9a60
Patch-mainline: v6.1-rc1
References: git-fixes

The function devm_ioremap() in docg3_probe() can fail, so
its return value should be checked.

Fixes: 82402aeb8c81e ("mtd: docg3: Use devm_*() functions")
Reported-by: Hacash Robot <hacashRobot@santino.com>
Signed-off-by: William Dean <williamsukatube@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220722091644.2937953-1-williamsukatube@163.com
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/mtd/devices/docg3.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index 5b0ae5ddad74..27c08f22dec8 100644
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -1974,9 +1974,14 @@ static int __init docg3_probe(struct platform_device *pdev)
 		dev_err(dev, "No I/O memory resource defined\n");
 		return ret;
 	}
-	base = devm_ioremap(dev, ress->start, DOC_IOSPACE_SIZE);
 
 	ret = -ENOMEM;
+	base = devm_ioremap(dev, ress->start, DOC_IOSPACE_SIZE);
+	if (!base) {
+		dev_err(dev, "devm_ioremap dev failed\n");
+		return ret;
+	}
+
 	cascade = devm_kcalloc(dev, DOC_MAX_NBFLOORS, sizeof(*cascade),
 			       GFP_KERNEL);
 	if (!cascade)
-- 
2.35.3