linux-kernel - [PATCH 5.10 701/717] memory: jz4780_nemc: Fix an error pointer vs NULL check in probe()

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Date:   Mon, 28 Dec 2020 13:51:39 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Paul Cercueil <paul@...pouillou.net>,
        Krzysztof Kozlowski <krzk@...nel.org>
Subject: [PATCH 5.10 701/717] memory: jz4780_nemc: Fix an error pointer vs NULL check in probe()

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 96999c797ec1ef41259f00b4ddf9cf33b342cb78 upstream.

The devm_ioremap() function returns NULL on error, it doesn't return
error pointers.  This bug could lead to an Oops during probe.

Fixes: f046e4a3f0b9 ("memory: jz4780_nemc: Only request IO memory the driver will use")
Cc: <stable@...r.kernel.org>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Paul Cercueil <paul@...pouillou.net>
Link: https://lore.kernel.org/r/20200803143607.GC346925@mwanda
Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/memory/jz4780-nemc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/memory/jz4780-nemc.c
+++ b/drivers/memory/jz4780-nemc.c
@@ -306,9 +306,9 @@ static int jz4780_nemc_probe(struct plat
 	}
 
 	nemc->base = devm_ioremap(dev, res->start, NEMC_REG_LEN);
-	if (IS_ERR(nemc->base)) {
+	if (!nemc->base) {
 		dev_err(dev, "failed to get I/O memory\n");
-		return PTR_ERR(nemc->base);
+		return -ENOMEM;
 	}
 
 	writel(0, nemc->base + NEMC_NFCSR);