linux-kernel - [PATCH AUTOSEL 4.20 136/304] gpio: mt7621: report failure of devm

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Message-Id: <20190128154341.47195-136-sashal@kernel.org>
Date:   Mon, 28 Jan 2019 10:40:53 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Nicholas Mc Guire <hofrat@...dl.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Sasha Levin <sashal@...nel.org>, linux-gpio@...r.kernel.org
Subject: [PATCH AUTOSEL 4.20 136/304] gpio: mt7621: report failure of devm_kasprintf()

From: Nicholas Mc Guire <hofrat@...dl.org>

[ Upstream commit 59d646c775d6ae688ee90fda9f2a4270c47b7490 ]

kasprintf() may return NULL on failure of internal allocation thus the
assigned  label  is not safe if not explicitly checked. On error
mediatek_gpio_bank_probe() returns negative values so -ENOMEM in the
(unlikely) failure case should be fine here.

Fixes: 4ba9c3afda41 ("gpio: mt7621: Add a driver for MT7621")
Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Acked-by: Sean Wang <sean.wang@...nel.org>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpio/gpio-mt7621.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpio/gpio-mt7621.c b/drivers/gpio/gpio-mt7621.c
index d72af6f6cdbd..1ec95bc18f5b 100644
--- a/drivers/gpio/gpio-mt7621.c
+++ b/drivers/gpio/gpio-mt7621.c
@@ -244,6 +244,8 @@ mediatek_gpio_bank_probe(struct device *dev,
 	rg->chip.of_xlate = mediatek_gpio_xlate;
 	rg->chip.label = devm_kasprintf(dev, GFP_KERNEL, "%s-bank%d",
 					dev_name(dev), bank);
+	if (!rg->chip.label)
+		return -ENOMEM;
 
 	ret = devm_gpiochip_add_data(dev, &rg->chip, mtk);
 	if (ret < 0) {
-- 
2.19.1